Characters using both Vampirism and Werediggle Curse should turn into a recolor of Vlad Digula when they assume Diggle form. I don't know if there is any simple way for you to do this, but if there is it would be cool to see.
This idea has a lot of potential. Like... combine bat form with werediggle form to get vlad digula form.
It could be one of those synergy abilities we are trying to figure for the werediggle curse. It could be a werediggle-only skill which unlocks when a character has capped the vampire ability: a new polymorph to unlock full power, which uses the vlad digula skin and gives you some more stats for werediggle, like more agility or I dunno (more regen, so you can drain more?). Or it could be an ability which unlocks into batty form, which gives you the halfdiggle half vampire sprite. Or it could be both. I would change the skin a little, though, since Digula is an unique monster.
You can give the vampire a permanent buff which does nothing, and upon polymorphing into diggle form you trigger instead the Vlad Digula form.
In true Roguelike tradition, Vlad Digula should be harder if you have both Vampirism and Werediggle activated to make this buff. Buff his stats by about 1/4 or 1/3, maybe, and let him see through invisibility just to make it tougher. [/troll face]
Exactly, Bohandas. Set a trigger inside of Werediggle Curse that says "if Batty Form is active, use this alternate Werediggle polymorph instead.." the only problem is, you'd basically have to copy-paste the entire Werediggle tree keyed to the second form, because they'd technically be different polymorphs. But that's feasible, just...clumsy.
The problem is: both batty and diggle form skills are only for human form, and no one of them leaves you with a permanent buff of sort.
It's not like you can't make that buff proc automatically on hit/spell use/whatever. It wouldn't be completely fool-proof, but pretty close to it.
Maybe a 1 turn buff that procs upon drinking the blood of enemies, which then trigger the vlad digula form upon polymorphing into a werediggle.
Maybe. And it can even be permanent instead of only lasting one turn if you wish for it to be; there you go.