Tuesday, December 30, 2025

Holdings and the Multiworld Clan

Aihao (Iwahfuah 2409 A9CA947-C), the industrial capital of the multiworld Hlaotiyoiho (Manytongues) clan, a likely Tlaukhu contender ranked 30th in the Hierate, and said to control over 50 mainworlds.

Clans of the Aslan introduced the clan profile, which defines an Aslan clan much like the world profile defines a Traveller world. One of the keystone characteristics is Holdings, which measures the amount of mainworld territory directly controlled by the clan. (A clan might also hold additional territory on secondary or split-control worlds, or in lands held by vassal clans in fief.)

A Holdings score of 4 or less indicates the clan controls less than one entire world; a Holdings score of 5 indicates the clan dominates exactly one mainworld in its entirety; and a Holdings score of 6 or more indicates the clan controls two or more mainworlds. Each step in this scale represents a rough doubling of worlds:

Clan Holdings Scores
HoldingsDescriptionAverage
62–3 worlds2.5
74–7 worlds5.5
88–15 worlds11.5
916–31 worlds23.5
A32–63 worlds47.5

A Multiworld clan therefore will always have a Holdings score between 6 and A. Aslan worlds controlled by Multiworld clans can be identified by either Government Type K or the allegiance code AsMw.

In a previous post on Independent Clans we assumed that approximately 1,300 worlds in the Hierate are controlled by Multiworlds clans, and an average Multiworld clan controlled 17 worlds, implying there were probably around 76 different Multiworld clans. These estimates were reflected in this passage from Clans of the Aslan:

There are probably less than 100 Multiworld clans in the entire Hierate. On average, Multiworld clans have populations in the low tens of billions. These clans can hold as few as two mainworlds to over 30, with an average somewhere between 12 and 24 worlds.

These estimates are also reflected in the clan generation system, where the average Holdings score is between 8 and 9.

While I think the clan generation system works perfectly well for fleshing out a handful of clans for a subsector, as I worked up details on an entire sector I felt the system was producing too many Multiworld clans with Holdings scores that were too high, even though the averages were consistent with our previous assumptions. Hlakhoi sector, for example, has 78 worlds with the AsMw allegiance code—which, with an average of 17 worlds apiece, would represent only 4–5 Multiworld clans. This struck me as far too few, even assuming that Multiworld clan territories overlap sector boundaries.

I was also concerned with how these Multiworld clan results stacked up against the Tlaukhu clans. When I first reverse-engineered the composition of the Hierate, I assumed all Tlaukhu clans had Holdings scores of A, and thus an average Multiworld clan Holdings of 8 or 9 made sense. But once I had sleuthed out details on the individual Tlaukhu clans, I ended up with a handful of Tlaukhu clans with Holdings as low as 8, and another handful with Holdings as high as B. This meant the average Multiworld clan had Holdings comparable to the weakest Tlaukhu members. While some overlap in strength between the two groups is both reasonable and desirable, too much would contradict previous canon, which holds that membership on the Twenty-Nine is relatively stable.

The problem, I concluded, was that clan Holdings should likely exhibit a highly skewed distribution, wherein a small number of very large clans push the average Holdings results upward, much like average “real world” incomes can be skewed upward by just a few ultra-wealthy individuals. Traveller world populations exhibit a similar skew, as each increment in the Population code represents an order-of-magnitude increase in population. Using straight-up world generation, the average Traveller world has a population of 1.71 billion, which is driven by only a handful of Pop A worlds.

For skewed data like World Population, real-world income, or clan Holdings, the median value is often more informative than the average value, as it reduces the impact of extreme outliers on either end of the data set. So while the average Traveller world population is 1.71 billion, the median population is only 500,000. Roughly half of the worlds produced by Traveller world generation would be expected to have populations below 500,000, while half would have populations above 500,000.

By going back to basics, I played with a 2D6 distribution that would produce more Multiworld clans with lower Holdings scores and much fewer clans with higher Holdings scores. I wanted to target a Holdings score of 7 (4–7 mainworlds) as the median result.

Multiworld Clan Revised Holdings Distribution
2DProbabilityHoldingsTotal
Clans
Worlds/ClanTotal
Worlds
Weighted
Result
22.77%642.5100.07
35.55%692.5230.14
48.33%6132.5330.21
511.11%7175.5940.61
613.88%7225.51210.76
716.66%7265.51430.92
813.88%7225.51210.76
911.11%81711.51961.28
108.33%81311.51500.96
115.55%9923.52121.30
122.77%A447.51901.32
 1561,2938.326

With this distribution, the median number of mainworlds controlled by a Multiworld clan drops to 5.5 (Holdings 7), with an average of 8.33 (Holdings 8). This seems much more reasonable to me, though it does increase the expected total number of Multiworld clans in the Hierate from 76 to 156. These results can be further consolidated like so:

Multiworld Clan Holdings
2DProbabilityHoldingsClansWorlds
2–416.65%62666
5–855.53%787479
9–1019.44%830346
115.55%99212
122.77%A4190
 1561,293

Based on these changes, the description of Multiworld clans in Clans of the Aslan could be revised to read:

There are probably more than 150 Multiworld clans in the entire Hierate. Multiworld clans have median populations in the high hundreds of millions and average populations in the low billions. These clans can hold as few as two mainworlds to over 30, with an average somewhere between 6 and 12 worlds. A Multiworld clan also controls a comparable number of secondary worlds and have many smaller holdings on split-control worlds.

With these change in mind, the table of Random Clan Holdings on page 79 of Clans of the Aslan can thus be expanded from a 1D to 2D table like this:

Random Clan Holdings (Revised)
2DMajorMultiworldSingle
World
Minor Major
Vassal
Vassal Minor
Vassal
28650530
38650530
48650540
59750650
69751651
79751761
8A752762
9A852762
10A853773
11B954773
12BA54773

The old table works fine for most uses, but if a referee wanted to develop an area larger than a subsector or two, this revised version should work better for that purpose. Using this, the number of Multiworld clans in Hlakhoi increased to twelve, with one clan with Holdings A, one with Holdings 9, three with Holdings 8, three with Holdings 7, and four with Holdings 6—a much more varied and interesting result, in my mind.

Copyright Information

The Traveller, 2300AD and Twilight: 2000 games in all forms are owned by Mongoose Publishing. Copyright 1977 - 2025 Mongoose Publishing. Traveller is a registered trademark of Mongoose Publishing. Mongoose Publishing permits web sites and fanzines for this game, provided it contains this notice, that Mongoose Publishing is notified, and subject to a withdrawal of permission on 90 days notice. The contents of this site are for personal, non-commercial use only. Any use of Mongoose Publishing’s copyrighted material or trademarks anywhere on this web site and its files should not be viewed as a challenge to those copyrights or trademarks. In addition, any program/articles/file on this site cannot be republished or distributed without the consent of the author who contributed it.

Friday, December 19, 2025

Sleuthing Out Tlaukhu Details

Hlakhoi (-4/-2) sector, known to the ancient Terrans as Albireo.

I turned in The Aslan Hierate manuscript back at the end of October; the book is currently on the Mongoose Release Schedule for next summer. Unfortunately, I have been too busy on various projects to catch up with this poor, neglected blog.

I haven’t been completely idle on the Traveller front, though: I’ve provided a few suggested tweaks regarding Aslan Traveller generation for the upcoming revision to Aliens of Charted Space Volume 1. I’ve also been hard at work outlining a campaign book with the working title of Kith and Clan. I’m shooting for a big, sandboxy romp very much in the same vein as Pirates of Drinax, but set in Hlakhoi sector.

As part of this work I’ve been playing with the clan generation system from Clans of the Aslan, and realized I’ve never really explained how I derived many of the details for the 29 Tlaukhu members that appeared in Clans. I’ve previously discussed a bit of this in an older post on Developing the Tlaukhu.

To recap, we know from the CT Aslan Alien Module (1984) that the “Hierate includes more than 4,000 clans spread across about 7,000 worlds in 17 sectors.” Aslan world generation and published sector data indicates how many of these worlds are controlled by members of the Tlaukhu.

Unlike other types of Aslan clans, we know the names of all 29 members of the Tlaukhu, their relative ranking to each other, and their associated power bloc and the ranking of those alliances:

Tlaukhu Power Blocs
Power BlocMember Clans
AsT0Yerlyaruiwo (1), Hrawoao (13), Eisohiyw (14), Ferekhearl (19)
AsT1Khaukheairl (2), Estoieie’ (16), Toaseilwi (22)
AsT2Syoisuis (3)
AsT3Tralyeaeawi (4), Yulraleh (12), Aiheilar (25), Riyhalaei (28)
AsT4Hrasua (5), Eteawyolei’ (11), Fteweyeakh (23)
AsT5Hlyueawi (6), Isoitiyro (15)
AsT6Uiktawa (7), Iykyasea (17), Faowaou (27)
AsT7Ikhtealyo (8), Tlerfearlyo (20), Yehtahikh (24)
AsT8Seieakh (9), Akatoiloh (18), We’okunir (29)
AsT9Aokhalte (10), Sahao’ (21), Ouokhoi (26)

This information allows us to estimate additional details about the Tlaukhu members. We know from our post on Governments and Allegiances in the Hierate that there are probably about a thousand worlds (16%) completely controlled by a Tlaukhu clan. Evenly distributed, this would be about a hundred worlds per power bloc or a little more than 34 worlds per individual Tlaukhu clan.

The composition of the Tlaukhu has been fairly stable for over 3,000 years, at least in terms of individual members: most current seats have been held by the same clan since the council’s founding. We also know that members are not completely equal, as they can be ranked both individually and collectively as power blocs. So I assume the most powerful Tlaukhu members are much more powerful than the weakest ones, but not so powerful as to bully their lessers with impunity. In fact, the various blocs probably arose to address persistent power disparities.

I further assume that the best indicator of power among the Tlaukhu members is probably the number of worlds controlled. While other considerations undoubtedly influence rankings, such as honor, cultural or historical importance, or economic and military might, the sheer number of worlds under direct control is probably the clearest signal of clout.

To start, I looked at dividing up a thousand worlds between the ten power blocs. First I ordered the ten blocs by rank. I assumed that the first ranked bloc (Yerlyaruiwo) would not be more powerful than the bottom two blocs (Seieakh and Aokhalte) combined. So I assigned the first ranked bloc an arbitrary strength of 1, and the tenth ranked bloc exactly half that: 0.5. I then did just a simple linear interpolation for the remaining eight blocs. An interval of 0.05556 separated each consecutive bloc. These strengths sum to a total of 7.5, which I used to develop prorated estimates of the number of worlds controlled by each bloc:

Tlaukhu Bloc Strength and Estimated Worlds
Power Bloc Rank Bloc
Strength
Worlds
Controlled
First (Yerlyaruiwo) 1 1.00 139.20
Second (Khaukheairl) 2 0.94 131.47
Third (Syoisuis) 3 0.89 123.73
Fourth (Tralyeaeawi) 4 0.83 116.00
Fifth (Hrasua) 5 0.78 108.27
Sixth (Hlyueawi) 6 0.72 100.53
Seventh (Uiktawa) 7 0.67 92.80
Eighth (Ikhtealyo) 8 0.61 85.07
Ninth (Seieakh) 9 0.56 77.33
Tenth (Aokhalte) 10 0.50 69.60

Thus, the first (Yerlyaruiwo) bloc was estimated to control 140 worlds, while the tenth (Aokhalte) bloc was estimated to control 70. Now that we’ve estimated the number of worlds controlled by each bloc, we can further break these numbers down to individual Tlaukhu clans.

We know the number and identity of Tlaukhu clans within each bloc as well as their individual rank. I simply grouped each bloc member by relative rank within their bloc: 1st, 2nd, 3rd, or 4th. As a starting estimate, I assumed the second-ranked clan controlled half the worlds of the first ranked clan, the third controlled a third, and the fourth, a fourth. This resulted in the following distribution:

World Distribution within Tlaukhu Blocs
Power Bloc No. of
Members
Worlds by Member Total
Worlds
1st 2nd 3rd 4th
First (Yerlyaruiwo) 4 67 34 22 17 140
Second (Khaukheairl) 3 72 36 24 132
Third (Syoisuis) 1 124 124
Fourth (Tralyeaeawi) 4 56 28 19 14 117
Fifth (Hrasua) 3 59 30 20 109
Sixth (Hlyueawi) 2 67 34 101
Seventh (Uiktawa) 3 51 26 17 94
Eighth (Ikhtealyo) 3 46 23 15 84
Ninth (Seieakh) 3 42 21 14 77
Tenth (Aokhalte) 3 38 19 13 70

I then laid out all 29 Tlaukhu members in order. I had honestly expected the result would need a lot of hand tweaking but the raw numbers seemed pretty decent:

Tlaukhu Worlds by Clan Rank
Rank Clan Bloc Worlds
1 Yerlyaruiwo AsT0 67
2 Khaukheairl AsT1 72
3 Syoisuis AsT2 124
4 Tralyeaeawi AsT3 56
5 Hrasua AsT4 59
6 Hlyueawi AsT5 67
7 Uiktawa AsT6 51
8 Ikhtealyo AsT7 46
9 Seieakh AsT8 42
10 Aokhalte AsT9 38
11 Eteawyolei’ AsT4 30
12 Yulraleh AsT3 28
13 Hrawoao AsT0 34
14 Eisohiyw AsT0 22
15 Isoitiyro AsT5 34
16 Estoieie’ AsT1 36
17 Iykyasea AsT6 26
18 Akatoiloh AsT8 21
19 Ferekhearl AsT4 17
20 Tlerlearlyo AsT7 23
21 Sahao’ AsT9 19
22 Toaseilwi AsT1 24
23 Fteweyeakh AsT4 20
24 Yetahikh AsT7 15
25 Aiheilar AsT3 19
26 Ouokhoi AsT9 13
27 Faowaou AsT6 17
28 Riyhalaei AsT3 14
29 We’okurir AsT8 14

Note that “worlds” here refers only to main worlds directly controlled by a single clan. Each Tlaukhu clan has a comperable number of worlds held in fief by Tlaukhu Vassal clans, as well as additional holdings on Split Control and secondary worlds. All told, the main worlds might only represent about a third of a clan’s total holdings. Knowing the number of worlds held by vassals also helps us estimate the number of vassals sworn to each Tlaukhu clan.

These numbers help explain the importance of power blocs among the Tlaukhu members. Although the Yerlyaruiwo clan individually holds only the third-highest number of worlds in the Hierate, their leadership atop the most powerful bloc helps place them as the top-ranked clan. In contrast, the Syoisuis clan, which controls almost twice the number of worlds as the next largest clan, has no allies and thus is only ranked third in the Hierate. This also explains why the clan has adopted a “studied neutrality” in Hierate politics: it is vulnerable to an attack from any two blocs.

Copyright Information

The Traveller, 2300AD and Twilight: 2000 games in all forms are owned by Mongoose Publishing. Copyright 1977 - 2025 Mongoose Publishing. Traveller is a registered trademark of Mongoose Publishing. Mongoose Publishing permits web sites and fanzines for this game, provided it contains this notice, that Mongoose Publishing is notified, and subject to a withdrawal of permission on 90 days notice. The contents of this site are for personal, non-commercial use only. Any use of Mongoose Publishing’s copyrighted material or trademarks anywhere on this web site and its files should not be viewed as a challenge to those copyrights or trademarks. In addition, any program/articles/file on this site cannot be republished or distributed without the consent of the author who contributed it.