Every time Mechuiti takes piercing or slashing damage, a spray of caustic blood spurts from the wound toward the attacker. This spray forms a line 10 feet long and 5 feet wide. The first creature in the line must make a successful DC 24 Constitution saving throw against disease or be infected by Mechuiti’s Ichor disease. The creature is poisoned until the disease is cured. Every 24 hours that elapse, the target must make a successful DC 24 Constitution saving throw or reduce its hit point maximum by 5 (2d4). The disease is cured on a success. The target dies if the disease reduces its hit point maximum to 0. This reduction to the target’s hit point maximum lasts until the disease is cured.

If Mechuiti fails a saving throw, it can choose to succeed instead.

Mechuiti has advantage on saving throws against spells and other magical effects.

Mechuiti’s weapon attacks are magical.

on initiative count 20 (losing initiative ties), Mechuiti takes a lair action to cause one of the following effects. Mechuiti can’t use the same effect two rounds in a row.

• Mechuiti targets one creature it can see within 120 feet of it, and a fissure full of lava opens under the target’s feet. The target must succeed on a DC 20 Dexterity saving throw or take 28 (8d6) fire damage.

• The whole volcano trembles and shakes. Each creature on a solid surface other than a demon must succeed on a DC 20 Dexterity saving throw or be knocked prone. All ground in the volcano becomes difficult terrain for creatures other than a demon until initiative count 20 on the next round.

• Volcanic gases form a cloud in a 20-foot-radius sphere centered on a point Mechuiti can see within 120 feet of it. The sphere spreads around corners, and its area is lightly obscured. It lasts until initiative count 20 on the next round. Each creature that starts its turn in the cloud must succeed on a DC 15 Constitution saving throw or be poisoned until the end of its next turn. While poisoned in this way, a creature is incapacitated.

• The pain of all creatures other than demons within 120 feet of Mechuiti is intensified. Until initiative count 20 on the next round, every time a creature affected this way takes damage, he must succeed on a DC 15 Constitution saving throw or be stunned until the end of its next turn.

the region containing Mechuiti’s lair is warped by its presence, which creates one or more of the following effects.

• Mechuiti can make the volcano erupt at will. A cloud of hot ashes and smoke covers a 6 mile area around the volcano, and magma flows from the volcano’s cone.

• When intelligent creatures within 6 miles sleep, they dream with Mechuiti. Unless they make a successful DC 15 Wisdom saving throw, they are compelled to seek out and join Mechuiti’s cult.

• Water within 1 mile of the lair carries Mechuiti’s Ichor disease. Any creature that drinks the water must make a successful DC 15 Constitution saving throw against disease or be infected. An infected creature is poisoned until the disease is cured. Every 24 hours that elapse, the target must repeat the saving throw. On a failure, its hit point maximum is reduced by 5 (2d4). The disease is cured on a success. The target dies if the disease reduces its hit point maximum to 0. This reduction to the target’s hit point maximum lasts until the disease is cured.

when Mechuiti dies, all these regional effects fade immediately.

Mechuiti can communicate simple concepts to apes.