This is the latest entry in a series of Mars Attacks! creatures I converted for Fifth Edition Dungeons & Dragons. You can download all the monsters here.
An enormous green caterpillar over a thousand feet long twines its way around buildings.
Martians uses these green horrors as heavy artillery, sending them winding through enemy troops and destroying all structures in their path.
Gargantuan monstrosity (insect, mutant), unaligned
Armor Class 20 (natural armor)
Hit Points 276 (24d20+24)
Speed 40 ft., climb 40 ft.
STR | DEX | CON | INT | WIS | CHA
20 (+5) | 13 (+1) | 12 (+1) | 2 (-4) | 10 (+0) | 2 (-4)
Skills Perception +5
Damage Resistances poison
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 15
Challenge 14 (11,500)
Siege Monster. The monstrous caterpillar does double damage to objects and structures.
Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (4d6 + 5) piercing damage and the target is grappled (escape DC 15). If the target is Large or smaller, it is also restrained until this grapple ends. While grappling the target, the monstrous caterpillar has advantage on attack rolls against it and can't use this attack against other targets. When the monstrous caterpillar moves, any Large or smaller target it is grappling moves with it.
Chew. The monstrous caterpillar chews on a nonmagical ferrous metal object it can see within 5 feet of it. If the object isn't being worn or carried, it destroys a 10-foot cube of it. Beings trapped inside the object can dodge jump free with a DC 14 Dexterity saving throw. Failure means each target is subjected to a bite attack as a bonus action.
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