Gothic/NPCs

Monsters
Generally any character you can't have dialog with. XP earned is the level times 10. A meatbug is level 1, so 1 times 10 is 10 XP. A scavenger is level 5, so 5 times 10 is 50 XP.

Characters
Generally characters you can have dialog with. (including some orcs) XP earned for defeating/killing is the level times 10. Shrike is level 6, so 6 times 10 is 60 XP. Mud is level 0, so 0 times 10 is.. Oh, Mud really is useless I guess.