Succubus updates

Hello,

Here's a few updates fot the succubus, this includes the bugfixes discussed in the main train as well as new summons.

Here's a changelog:
+ New Summons
- Devilkin, a weak but cheap demon
- Fire maiden, who will burn your enemies
- Hellhound, large fire breathing dogs
- Cerberus, large fire breathing dogs with three heads !
- Nightmare, large fire breathing flying horses
- Spirit of fire, huge fire creatures
- Frost wraith, huge ice creatures
- Bebilith, large spiders with a necrosis poison
- Obsidian colossus, huge rock creature