Character: Firo Prochainezo Powers/abilities: Immortality/regeneration. At full power, any damage, wounds, or just changes to his body, and even death will reverse in a matter of seconds or minutes. The more times he gets injured in a certain spot, the faster that area will heal in the future. It also prevents aging. Any nasty side-effects or drawbacks: Eternal life can easily become eternal torture. Immortals can be put into situations where they are inhibited enough to suffer and die repeatedly. (For a canon example, one character was cemented in a barrel and dropped in the river to drown again and again for years.) As regeneration under normal conditions is involuntary, there isn't much of a way for them to get out of these situations. Immortals can also be killed by being "devoured" by another immortal; their entire essence, all their memories, go into the other immortal.
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Powers/abilities: Immortality/regeneration. At full power, any damage, wounds, or just changes to his body, and even death will reverse in a matter of seconds or minutes. The more times he gets injured in a certain spot, the faster that area will heal in the future. It also prevents aging.
Any nasty side-effects or drawbacks: Eternal life can easily become eternal torture. Immortals can be put into situations where they are inhibited enough to suffer and die repeatedly. (For a canon example, one character was cemented in a barrel and dropped in the river to drown again and again for years.) As regeneration under normal conditions is involuntary, there isn't much of a way for them to get out of these situations. Immortals can also be killed by being "devoured" by another immortal; their entire essence, all their memories, go into the other immortal.