Clockwork Mage

Immutable Form. The clockwork mage is immune to any spell or effect that would alter its form.
Magic Resistance. The clockwork mage has advantage on saving throws against spells and other magical effects.
Silent Caster. The clockwork mage doesn't need verbal components to cast spells.
Quickened Cast. When the clockwork mage casts a spell that has a casting time of 1 action, it may instead change the casting time to 1 bonus action. The clockwork mage may do this twice every encounter.

Spellcasting. Each hand is capable of a different elemental spell; Hand 1 - Fire, Hand 2 - Lightning, Hand 3 - Air, Hand 4 - Earth. Its spellcasting modifier is Intelligence.

Cantrips. Hand 1 - Control Flames, Fire Bolt, Produce Flame; Hand 2 - Lightning Lure, Shocking Grasp; Hand 3 - Gust, Thunderclap; Hand 4 - Magic Stone, Mold Earth

8/Day. Hand 1 - Burning Hands, Hellish Rebuke; Hand 2 - Witch Bolt; Hand 3 - Feather Fall, Jump, Thunderwave, Warding Wind; Hand 4 - Earth Tremor

6/Day. Hand 1 - Flaming Sphere, Scorching Ray; Hand 2 - Nothing; Hand 3 - Shatter, Silence; Hand 4 - Earthbind, Maximilian's Earthen Grasp

4/Day. Hand 1 - Fireball; Hand 2 - Lightning Bolt; Hand 3 - Wind Wall; Hand 4 - Erupting Earth

2/Day. Hand 1 - Wall of Fire; Hand 2 - Storm Sphere; Hand 3 - Nothing; Hand 4- Stone Shape

1/Day. Hand 1 - Flame Strike; Hand 2 - Nothing; Hand 3 - Cone of Cold; Hand 4 - Wall of Stone 

Clockwork Proficiencies: The Clockwork Mage is proficient in Intelligence (History) and Wisdom (Perception) checks while in Mechanus.

Multiattack. Clockwork Mage can cast up to 2 spells per turn.

Cast Spell. Clockwork Mage is able to cast any spell if it is available. 

Shield. As a reaction, the clockwork mage may conjure a shield that gives +2 to AC only when in Mechanus. If used outside of Mechanus, the mage gets -2 to AC.