Brain of Iuz

Innate Spellcasting.

Spellcasting. The Brain of Iuz is a 2nd-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 13, +3 to hit with spell attacks). T has following warlock spells prepared:
1st level (3 slots): Arms of Hadar.                                                                                                   2nd level (at will) Mirror Image, Misty Step.

Phases. The first time the Brain of Iuz reaches 30% hp it enters Phase 2. Once in Phase 2 the Brain of Iuz Goes to 50% hp and gains access to Madness Charge and Blood Shots and takes 5 less damage to all non-magic attacks.

Actions. The Brain of Iuz can make two the actions listed below. Hanos can cast one spell instead of one action. Not able to use actions aside from movement while Creeping is alive.

Summon Creeping. Summons 3 Waves of 10 Creeping, while Creeping are alive the Brain of Iuz does not take damage. Usable once, forced to be used on first turn, always goes first.

Spine Whip. Melee Attack: +1 to hit, range 10ft. 3 targets. Hit:14 (2d8+2) Necrotic damage. Only usable in Phase 1.

Madness Charge. Melee Attack: +5 to hit, range 40ft line. ∞ targets. Hit:26 (3d10+3) Bludgeoning damage. Only usable in Phase 2.

Blood Shots. Ranged Attack: +2 to hit, range 30/60ft. 3 targets: Hit:12 (2d6+4) Poison damage. Only usable in Phase 2.

Regrowth. Uses its heart to heal (2d6+2) hp.

Mirror Dodge. When an attack hits the Brain of Iuz, it rolls a d20, if above 17, attack misses.