5th edition conversion for the Rotgrub

When I started making my homage to Keep on the Borderlands, I knew I would want the infamous rot grub for 5e D&D.  However, there probably need to be a few mechanical tweaks on this 30+ year old “save or die” monster.

Tiny aberration, neutral
Armor Class 10
Hit Points 1
Speed 10 ft.
1 (-5) 10 (+0) 10 (+0) 1 (-5) 4 (-3) 1 (-5)
Skills Stealth +4
Senses tremorsense 15 ft., passive perception 10
Languages none
Challenge 1/8 (25 XP)
Burrow. Melee Weapon Attack: +4 to hit, reach 0 ft., one target. Hit: 1 piercing damage, and the rotgrub burrows its head into the flesh of the victim. While burrowed, the rotgrub makes the dig action instead. It is assumed that rotgrub initially attaches in a forearm or shin, since those are the closest.  A burrowing rotgrub cannot normally be targeted for attacks.  However, if fire damage is inflicted on the victim’s extremity, the rotgrub also takes that damage as long as the rotgrub has not been able to make a successful dig action.
Dig. The target must succeed on a DC 10 Constitution saving throw or the victim suffers 1d4 damage, and the rotgrub travels the same number of inches deeper towards the heart of the creature.   Once the rotgrub has performed Dig successfully, it can no longer be targeted by any outside attacks.   A rotgrub in a limb can be removed with amputation.  The amputation inflicts 1d4 damage for each point under 20 of a Wis-Medicine check.  If the rotgrub needs to be removed from the torso of a victim, the Wis-Medicine check is DC 30.

Rot grubs are horrid little beasts that resemble maggots.  Very large, 3 inch long maggots with multiple rows of barbed teeth.  Rot grubs will reside in any rotting substance, be it offal, dung, corpses, or rotting plants.  They are most commonly found in the corpses of previous victims, since they prefer the recently dead over long dead corpses.  When a corpse or other object infested with rot grubs is inspected, a victim must make a DC 14 Wis-Perception check to not be surprised by the emerging rotgrubs.


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