Clockwork Gear Mage

Clockwork Casting The clockwork gear mage can cast spells without needing verbal or material components.

Clockwork Heart When the clockwork gear mage is reduced to 0 hit points, it can make a DC 10 Constitution saving throw regaining 1 hit point on a success. For each success, the DC increases by 5. The DC resets after a long or short rest.

Construct Nature The clockwork gear mage does not need to eat, breath, or sleep

False Appearance While motionless, the clockwork gear mage is indistinguishable from a statue.

Gear Jam When the clockwork gear mage is hit with a critical hit, it must succeed a Constitution saving throw equal to half of the damage dealt (minimum 10) or be unable to cast or concentrate on spells until the end of its next turn.

Immutable Form The clockwork gear mage is immune to any effects or magic that would alter its form.

Internal Clock The clockwork gear mage has advantage on initiative checks.

Time Extension The clockwork gear mage can double the duration of its spell effects, up to a maximum of 24 hours

Spellcasting. The clockwork gear mage is a 8th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 14, +6 to hit with spell attacks). The clockwork gear mage has following spells prepared:
Cantrips (at will): firebolt, shocking grasp, light
1st level (4 slots): burning hands, magic missile, shield, Tenser's Floating Disk, witch bolt
2nd level (3 slots): spiritual weapon, cloud of daggers
3rd level (2 slots): counterspell, dispel magic, lightning bolt, fly
1st level (1 slots): summon construct, Otiluke's Resilient Sphere

Accelerated Casting(Recharge 5-6) The clockwork gear mage can use its bonus action to cast a spell with a casting time of an action.