Didn't notice the contest until too late.

My trait suggestion is called VAMPYRE or VAMPIRE or BLACK KNIGHT or something around that line

It is a quite powerful trait, one that can influence the whole gameplay for that particular character.

A Vampyre can either be a king or an emperor, but if he chooses humans over the fallen he's going to have a certain number of negative bonuses since they would probably be less inclined to accept a demon as king. (Negative bonuses could include less growth in cities, for example)

A Vampyre can:

1) Transmute into a wolf that runs very fast and is a good fighter but doesn't wear an armor.

2) Transmute into a bat that can fly over mountains and seas and also has a small vampiric skill (suck energy from enemies)

(The idea is that a playe should use his wolf form to be faster on land and his bat form to fly (not too fast) over impassable terrain. The form change should only be done at the beginning of a turn or maybe last a definite number of turn, so that there is an handicap connected to its use)

3) A Vampire should personally kill someone or something at least once every 20 turns or start to become too weak to walk (and maybe even eventually die) he could still be attacked and thus be able to regenerate.

4) A Vampire cannot have children (he's already strong enough like that)

Obviously the vampire idea is too good () to be limited to just that: a vampiric skill could certainly inspire all sort of variations like special buildings that allow a vampire to use special minions, a specific spell book and special vampiric weapons.

Cheers