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monster

The Magma-Wyrm

The Magma-Wyrm
Stat Block
CR 16
Reveal Stat Block
Armor Class
19
Hit Points
250
Speed
40 ft., burrow 40 ft.
str
26
dex
10
con
24
int
6
wis
12
cha
8
str
26
+8
dex
10
+0
con
24
+7
int
6
-2
wis
12
+1
cha
8
-1

Senses tremorsense 60 ft., darkvision 60 ft., passive Perception 11

Traits

Magma Trail.The Wyrm leaves a trail of magma where it moves. The area is difficult terrain and deals 11 (2d10) fire damage to any creature that starts its turn there.
Fire Immunity.The Wyrm is immune to fire damage.

Actions

Multiattack.The Wyrm makes two attacks: one with its bite and one with its tail.
Bite.Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 11 (2d10) fire damage.
Magma-Breath (Recharge 5-6).The Wyrm exhales magma in a 60-foot line. Each creature in the area must make a DC 20 Dexterity saving throw, taking 66 (12d10) fire damage on a failed save.

Ecology

The Magma-Wyrm is a massive, bio-engineered serpentine beast created by the shamans of Jarl Throm-Ka. It is composed of segments of flexible blackened iron fused with living magma and elemental fire. It is used as a living siege engine, capable of tunneling through the thickest glaciers and melting the foundations of dwarven fortresses in seconds.

Combat Mechanics

The Wyrm leaves a trail of molten rock wherever it moves, creating difficult terrain that deals fire damage to anyone standing in it. It can burrow through ice and stone with ease and possesses a "Magma-Breath" attack that deals massive fire damage in a 60-foot line. It is entirely immune to fire damage and regains hit points when it starts its turn submerged in lava or magma.

Loot

The scales of a Magma-Wyrm are made of "Volcanic Iron." These scales can be harvested and used by a master smith to forge armor that provides permanent immunity to fire damage and resistance to cold damage.