- Frank Mentzer, Dungeon Master's Guide to Immortals, 1986
These creatures attack 12 times per round, each of which ages the target 10-40 years with no save, and they heal themselves by pushing gods around in time.
Jumpers appear in groups of 1-8. That's up to 96 attacks, or 3,840 years of aging, per round. But don't worry, one or two might miss.
... Ready to roll Initiative?
(use that dead Jumper you've been carrying around)