Belos, Emperor of the Boiling Isles

Artifice Caster: Belos, Emperor of the Boiling Isles may cast spells at disadvantage without using spell slots. Additionally, when a spell targets Belos, Emperor of the Boiling Isles, it may roll a d4. On a 4, Belos, Emperor of the Boiling Isles may cast that spell as cantrip at disadvantage.

Loss of Control: When Belos, Emperor of the Boiling Isles is reduced to 0 hit points, it becomes a full health Belos, Soul-beast.

Spellcasting. Belos, Emperor of the Boiling Isles is an 18th level spellcaster. Its spellcasting ability is Charisma (spell save DC 20, +10 to hit with spell attacks). The Belos, Emperor of the Boiling Isles has following spells prepared:
Cantrips (at will): Lightning Lure, Mage Hand
5th level (3 slots): Hold Monster, Far Step
7th level (2 slots): Power Word Pain
8th level (2 slots): Power Word Stun

Glyph Magic (Recharge 6): Belos, Emperor of the Boiling Isles may use it's action to draw one of three glyph spells on an available surface. Plant Glyph causes vines to erupt from the glyph, attempting to restrain any creature except Belos, Emperor of the Boiling Isles within 20 feet of the glyph. The targeted creatures must succeed at a DEX or STR save against Belos, Emperor of the Boiling Isles' spell save DC, or fall prone and take 2d10 piercing damage. On a successful save, nothing happens. Frost Glyph creates a 30 foot diameter circular plane of ice. Movement cost is doubled for any creature in the ice plane, additionally any creature ending their turn in the ice field must make a DC 14 WIS check or have their speed reduced to zero until they succeed. This zone disappears if hit with any fire damage, or after 3 turns - whichever comes first. Flame Glyph causes a 15 foot diameter explosion on the end of the turn after it was placed. Any creature caught within it must make a DC 17 DEX save. On a failure, they take 3d12 + 7 fire damage. On a success, they take half damage.

Staff Strike: Melee Weapon Attack: +6 to hit, reach 5 ft., 1 target. Hit: 2d6 + 2 bludgeoning damage. 

Staff Beam: Ranged Weapon Attack: +10 to hit, range 60 ft., 1 target. Hit: 4d12 + 6 force damage.

Arcane Evasion: Belos, Emperor of the Boiling Isles may use it's action to give any creature making an attack roll targeting it disadvantage until the beginning of it's next turn. This effect ends if Belos, Emperor of the Boiling Isles is hit by a spell attack or weapon attack.

Staff Recharge: Belos, Emperor of the Boiling Isles may use its bonus action to recharge one spell slot of 7th level or below. 

Dash: Belos, Emperor of the Boiling Isles may use its bonus action to dash, doubling its movement speed until the end of its turn.

Action Surge (recharge 5-6): Belos, Emperor of the Boiling Isles may use its bonus action to regain its action.

Blink Dodge: When successfully hit by an attack, Belos, Emperor of the Boiling Isles may roll a d20. If the number on the d20 is above 12, Belos, Emperor of the Boiling Isles takes half damage. This reaction cannot be used against surprise attacks or attacks from creatures that Belos, Emperor of the Boiling Isles cannot see.