Skills not activating

Undead-Astronaut:
Mobtype: WITHER_SKELETON
Health: 500
Display: '&3&lUndead Astronaut'
Damage: 20
AttackSpeed: 4
ShowHealth: true
Despawn: true
Glowing: true
Equipment:
- iron_sword:0
- iron_sword:5
- glass:4
- diamond_chestplate:3
- diamond_leggings:2
- diamond_boots:1
AITargetSelectors:
- 0 clear
- 1 attacker
- 2 players
Type: <wither_skelton>
BossBar:
Enabled:...