Decaton Modron in Dungeons & Dragons 5e
Planescape: Adventures in the Multiverse • Morte’s Planar Parade
Decaton Modron CR: 8
STR
18 +4
DEX
12 +1
CON
16 +3
INT
15 +2
WIS
15 +2
CHA
11 +0
Perception +8
truesight 120 ft., passive Perception 18
Axiomatic Mind. The decaton can’t be compelled to act in a manner contrary to its nature or its instructions.
Combat Ready. The decaton has advantage on initiative rolls.
Disintegration. If the decaton dies, its body disintegrates into dust, leaving behind anything it was carrying.
Actions
Multiattack. The decaton makes three Tentacle attacks.
Tentacle. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage, and if the target is a Medium or smaller creature, it has the grappled condition (escape DC 14). Until this grapple ends, the decaton can’t use this tentacle against other targets. The decaton has ten tentacles, each of which can grapple one target.
Lightning Rays (Recharge 6). The decaton unleashes a barrage of lightning bolts from its eyes. Each creature within 30 feet of the decaton must make a DC 13 Dexterity saving throw, taking 38 (7d10) lightning damage on a failed save, or half as much damage on a successful save.
Spellcasting. The decaton casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 13):
At will: Detect Magic, Dispel Magic, Mending (as an action)
1/day each: Plane Shift (self only), Protection from Evil and Good
The least of the hierarchs, decatons monitor the physical well-being of base modrons. Two stubby legs support their spherical bodies, and ten mechanical tentacles sprout out from their rounded frames in all directions. Their heads contain ten eyes to readily observe the operations of surrounding base modrons. In emergencies, a decaton can discharge a bolt of electricity from each of its ten eyes, synchronizing them to deadly effect.
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