Regeneration

Regeneration is a status effect which increases a player's (or mob's) health over time and causes the health bar to jitter.

Effect
The amount of health healed over time is shown in the table below: Amplifiers outside the range 0–31 (corresponding to levels 1–32) are used modulo 32.

Immune mobs
Boss mobs and undead mobs are unaffected by Regeneration.

ID