A related question is if we're putting them into the same CC entry or two linked ones. I guess with linking, it doesn't make too much of a difference.
I was assuming we'd make it two CC entries.
If we used one entry called a "Bone Tyrant, Master" and included the Minions as a subentry it'd hide the latter's stats more than they need to be. Hmm, and it'd raise the question as to whether the single entry should just be called a "Bone Tyrant".
From looking at the original monster, it seems we should note that the Minions get banished back to the 9 Hells if the Master is destroyed. Seems like that would fit in Minion Bond. Or did we decide to drop that?
I think we should keep the "banishing minions" bit. We just forgot to include it.
How about giving both Master and Minion a Dependence special quality, e.g.:
Minion Dependence (Ex): Should one of a bone tyrant master's minions be destroyed, the master immediately gains one positive level. This level persists until the master can return to the lower planes and bond with a replacement minion.
If a bone tyrant master is destroyed, all of its minions are immediately banished to the lower planes they originated from.
Master Dependence (Ex): If a bone tyrant minion is destroyed while it is bonded to a bone tyrant master, the master immediately gains one positive level. If the bone tyrant master is destroyed, the minion is immediately banished to the lower plane it originated from.
The original monster Masters always seemed to have 6 minions, so I guess we should stick to that. But maybe the Minions should gain 1 HD per every 3 or 4 HD the Master gains in advancment. I don't think I'd necessarily have the Masters change size, but HD advancement up to maybe 22 HD would work.
Yes, I think something along those lines would be easier.
Hmm, but if we put a HD entry in the Minions' Advancement, that'd mean a Master could bond with Minions that've already been Advanced, which doesn't seem right.
Wouldn't it be better to have a more powerful master give negative levels to Minions it has bonded with, so they get the normal benefits of a "level boost" (+1 bonus on attack rolls, saving throws, skill checks, ability checks; increase of 5 hit points; and +1 to effective level) for each negative level.
Then we just need to decide on a HD/negative level ratio.
I like a two-to-one ratio, since that'd mean the Minions and Master's BAB and good saves increase in time with each other.