I always thought that wasps using souls were a little weird. After all is a matter of life, and that was good, but if you plan to add more "waspen trasformations" to simple things like crops and meat and leather and bone, it will follow the waspen gameplay and lore better than using souls necromantic-style.
And, after all, we already have brain essence which work in a similar manner (although brain essence only drop for our own civ members, so it's difficult to obtain). And wasps cannot store souls, so if you use them on a basis it's ok, if you don't start using them from the start here comes the difficulty about late game.
Also I like too the idea of "more waspen pets", like I was saying for the need of more pet mutations. More pets could give more utility to beasts, since for what I've seen the wasps don't have a butcherable reliable kind of pet: in many years of my fort, I've never butchered a single pet (also read as: most egg based pets are long to hatch or they never hatched to me). They don't need other fight pet, they just need big cow-like pets or small fast-breeding rat-like pets.
And this bring to another point of the post: my scorpions are in the very same room (not that just change anything, since spore breeding of v31...).
I've seen somewhere in the forums that egg breeding pets also need a special tag to make their eggs hatchable: since spiders work as intended, I don't think there should be problems in the code... but still, many years and no new scorpions.
ok, i fixed this. they could only be appointed by a colonist, so if you got a hive leader before you appointed one, then you would be unable to appoint swarmlords.
Yes, that was exactly the problem here.