Nimble Escape. Zrak can take the Disengage or Hide action as a bonus action on each of its turns.

Spellcasting. Zrak is a 7th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 13, +8 to hit with spell attacks). The goblin has following  spells prepared:

• Cantrips (at will): Fire Bolt, Ray of Frost, Shocking Grasp, Chill Touch
• 1st Level (4 slots): Mage armor, Thunderwave, Magic Missile
• 2nd Level (3 slots): Invisibility, Hold Person, Mirror Image
• 3rd Level (3 slots): Counterspell, Major image, Lightning Bolt
• 4th Level (1 slot): Dimension Door

Multiattack. Zrak casts one cantrip, and makes one attack with disadvantage with his quarterstaff. 

Quarterstaff.  Melee Weapon Attack: +1 to hit, reach 5 ft., one target.  Hit: 1d6 (1d8)-1 bludgeoning damage. 

Redirect Attack. When a creature Zrak can see targets him with an attack, Zrak chooses another goblin within 5ft of him The two goblins swap places, and the chosen goblin becomes the target instead.