Allow necromancers to animate bats, centipedes and trolls
There are couple of unusual undead creatures, would be great if necromancers will be allowed to create them as well.
- Allow necromancers from level 3 to animate giant centipede corpse into shadow centipede (costs 10 PP, centipede aren't common rarely drop corpse and have 3 HP only).
- Allow necromancers from level 6 to animate large bat, giant bat and huge bat corpses into ghost bat (costs 20 PP, ghost bats have 4 HP only but bats are very common and often drop corpses).
- Allow necromancers from from level 41 to animate troll, troll berserker, troll chief and troll king corpses into shadow troll (costs 6 Mana, quite strong).
Since prompt for corpse it brought up before list of possible slave types, shadow centipedes and ghost bat could be just created after selection (with confirmation if you think it's better).
As for shadow trolls - I think they should appear in list (e.g. in the end) only if troll corpse type is selected. Also I would dedicate special letter for it (e.g. [T]) so it won't change anything for player who already get used to existing keys.
How this would improve the game...
Don't think it will have much effects on gameplay, it's more just a nice detail to have.