This ring is ornately carved from some unknown bone. The carving appears to be a worm with a head emerging from the primary mouth about to eat its own tail.

1/long rest you can summon a sandworm to the battle

This creature lasts for 3 turns and is under the control of the wearer

AC 17; HP 110; SP 50

STR 20 (+5); DEX 6 (-3); CON 19 (+4); INT 1 (-5); WIS 8 (-1); CHA 4 (-3)]

Multi attack - head and tail

Bite: + 10 to hit 2d8+5 piercing 

a creature that is medium or smaller must clear a DC16 Dex or be swallowed

Swallowed: blind and restrained and 2d6 acid at the start of each turn; Must make 30+ damage to escape

Tail sting: +7 to hit 2d6 + 5

DC15 Con or take 3d6 poison, half on a success