Metamorphosis

is a physical mutation that allows the player to transform into a nearby creature.

This mutation grants the "Metamorphosis" activated ability, which when used on a creature within 1 tile of the player, will cause the player to become a near-perfect copy of that creature, inheriting their level, attributes, anatomy, mutations, skills, etc. The only stats the player will retain from their original body will be their Intelligence, Willpower, and Ego. The player will lose access to their own skills and mutations, but will retain their inventory; their equipment will automatically be equipped in the corresponding slots on their new body plan, or returned to their inventory if there are none. The player can choose to cancel this transformation at any time by using the "End Metamorphosis" ability, incurring a cooldown of a mutation level-based number of rounds.

The player is free to proceed in whatever form they've assumed indefinitely, and can do everything they normally could within their own bodies, including gaining levels, buying mutations, spending skillpoints, etc., though such changes to the new body will not carry over to their original body should they choose to end the Metamorphosis. XP gained while transformed will be applied to the original body when ending Metamorphosis, however.

Despite the description, the player is able to use Metamorphosis to transform into any creature, regardless of their level.

Formulas
The following formulas are used to determine cooldown and transformation level limit based on mutation level. Note that the transformation level limit currently is non-functional and has no impact on the performance of the mutation. Note that the cooldown can be a negative number. If this is the case, the mutation will essentially have no cooldown and can be used again instantly.