Regeneration
From The World Ends With You
Regeneration is a thread ability, coming in four separate levels. Whenever the shared HP bar is less than full, the wearer of the thread with this ability will regenerate HP every few seconds, higher levels granting a greater boost in HP per tick. The HP Bar will fill on the side of whoever is wearing the thread; overflow will fill the other side. However, remember it is a shared HP and so it really doesn't matter which part of the bar fills up first. If both characters have the Regeneration ability equipped, the amount of healing will add up. So if Neku heals 160 HP and Shiki heals 120 HP per tick, the amount regenerated would be 280. All Regeneration Threads stack with each other(two III Threads on a Player will restore 6% a tick, for example, as will an IV and a II).
Regeneration has four levels. Level I restores 1% HP/tick, level II 2% HP/tick, level III 3% HP/tick, level IV 4% HP/tick.
