Death Worm 2014
CR 1 monstrosity
Small monstrosity, unaligned
Can sense the general direction of creatures that aren’t Constructs or Undead within 1 mile of it.
When a creature ends its turn within 5 ft. of a death worm the creature takes 2 (1d4) lightning.
iIEvery 24 hrs that elapse it must re-save reducing its hp max by 2 (1d4) on a failure. The poison is neutralized on a success. Target dies if dreaming venom reduces its hp max to 0. This reduction lasts until the poison is neutralized.
When a creature starts its turn within 15 ft. of at least two death worms the creature must make DC 14 Dex save or take 5 (2d4) lightning. The creature has disadvantage on the save if it is within 15 ft. of three or more death worms.
Regains 3 hp at the start of its turn if it has at least 1 hp.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details