The effect monsters have is often significantly more powerful than the player version.
20+ Ring Of Regeneration 5E
Images. Ring, very rare (requires attunement). While wearing this ring, you regain 1d6 hit points every 10 minutes, provided that you have at least 1 hit point.
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Pick a ring/amulet/rock/whatever fits, decide on the regeneration effect, give it a catchy name, and you're set. If you lose a body part, the ring causes the missing part to regrow and return to full functionality after 1d6 + 1 days if you have at least 1 hit point the whole time. View all ftb twitter feed.
Ring, very rare (requires attunement).
It can also be used in a display stand to create an area of effect. While wearing a ring of regeneration, a character heals more quickly but also becomes more hungry. When player holds it in hand, ring provides regeneration effect. If you lose a body part, the ring causes the missing part to regrow and return to full functionality after 1d6 + 1 days if you have at.