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This pack includes:

Arena schematic
Skeleton swordsman
Skeleton spearman
Skeleton archer
Skeleton lich boss
Skeleton chest with key
2 shields
3 weapons
Boss skill models
Emissive textures
Mythicmob files
Both ItemsAdder and Modelengine configs

Mob special behaviors and abilities:

Skeleton swordsman:
Slowing slashes
Can block damage
Counterattacks

Skeleton spearman:
Piercing armor
Knockbacks
Can block damage
Counterattacks

Skeleton archer:
Dodges attacks
High mobility
Charged arrow attacks

Skeleton lich boss:
Life leech while immobilizing target
Basic chilling attacks
Buffs self and his minions
Rises skeleton armies
Frost ball chain bouncing between targets