Abilities, lots of em.
Vector 3D for angle calculations.
Many runnable utilities.

Abilities:

demoralizing roar,
firenova,
backstab,
ricochet/bankshot,
disarm,
fireball,
guardian angel,
mass destruction,
pick pocket,
rejuvenation,
shadowstep,
soul steal,
tracking

Runnables:

damage,
despawn,
heal,
effect,
entity effect,
set velocity

Utils:

Block utils,
hit vanished players,
vector3d