#i suggest you give it a listen

Creature: The Mechanist

tell me, mechanist, is it true?
does none of it bother you?

once upon a time, upon a time, behind us
the Mechanist inclined clockworks of time define us
who you are, who you are
merely springs that tick the time of things away

Spatial wanderer from Mechanus. The Mechanist is a strange, unknown creature that some insist they have met on their travels, but tales are spread far and wide and real truth is often muddled with grandiose tales of the being. The few things that are clear about its identity is that it is part machine, part human and that it travels to the other planes from Mechanus - but where its origins lie, none know. What is clear about it, however, is that it possesses the great, terrible power to warp and modify time, which means it is both widely feared and admired.

Time reversals. Locations that the Mechanist has visited often suffer from strange warps or folds in time, but none of the inhabitants of such locations can tell afterwards whether the warping started before or after the Mechanist arrives. Some suggest that it is attracted to these locations because of the inconsistent timelines that are already present, others argue that the mere presence of the Mechanist causes these temporal folds. In the grand scheme of things, others believe, in the life of a time-traveling, spatial-warping immortal creature, there is no difference between the two.

Chronological immortality. The Mechanist is immune to any effect that would age it, and it can’t die from old age.

Clockwork quintessence. When the Mechanist dies, its body vanishes. It returns to Mechanus, where it reforms and reawakens after 1d12 days.

Constructed hybrid nature. The Mechanist requires no air, food, drink or sleep. It has two creature types: construct and humanoid. It can be targeted by any effect if it applies to one of its creature types.