Pixel Monsters

A few minor changes and a hotfix

CHANGES:

- Changed experience requirement for several abilities

- Disabled several spells

- Halved mob health with difficulty scaling

FIXES:

- Replaced Corpse with TombManyGraves 2 (Corpses no longer generated on servers)

- Fixed wrong recipe in Beneath teleporter guide quest description

- Removed the Sandwich Station from the Pixel Monsters house structure