The monastery abbot and the cause of the curse that turned him and his fellow monks into cold zombie slaves of Rimiko the Hungry Storm.
Medium undead, neutral evil
Armor Class 14 (blue lamellar)
Hit Points 97 (13d8 + 39)
Speed 30 ft.
STR DEX CON INT WIS CHA
18 (+4) 10 (+0) 17 (+3) 12 (+1) 10 (+2) 5 (-3)
Damage Resistance necrotic
Damage Immunities cold, poison
Damage Vulnerabilities fire
Condition Immunities exhaustion, frightened, poisoned
Senses darkvision 60 ft., passive Perception 12
Challenge 5 (1,800 XP)
Cold Aura. Koyamata radiates an aura of intense cold. All creatures within 5 feet of the undead monster take 3 (1d6) points of cold damage.
Ice Walk. Koyamata can move across icy surfaces without needing to make an ability check. Additionally, difficult terrain composed of ice or snow doesn’t cost him extra movement.
Turn Resistance. Koyamata has advantage on saving throws against any effect that turns undead.
Undead Fortitude. If damage reduces Koyamata to 0 hit points, he must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is fire or from a critical hit. On a success, the mukurokoori drops to 1 hit point instead.
Freezing Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target.
Hit: 7 (1d6 + 4) bludgeoning damage and 7 (2d6) cold damage and the target loses 10 feet of movement until the end of its next turn.
Life Draining Yari (Spear). Melee Weapon Attack: +7 to hit, reach 10 ft., one target.
Hit: 13 (2d8 + 4) necrotic damage. The target must succeed on a DC 15 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. A humanoid slain by this attack rises 24 hours later as a mukurokoori under Koyamata’s control, unless the humanoid is restored to life or its body is destroyed. Koyamata can have no more than twelve mukurokoori under his control at one time.
Seven Spear Strike. When a target within 10 feet of Koyamata misses him with an attack he may use life draining yari once against each creature within reach.
In life, Koyamata Ito was a tall man, unbowed by his years. His greying hair was cut close to his scalp and he seldom wore armor, preferring the white and blue robes of the monastic order. In undeath, his handsome features become twisted and malevolent, his eyes burn with a cold blue flame, and his teeth and nails become sharp, like pieces of glass or ice.
A Loose Prayer Bead (requires attunement and provides +1 CON with no upper limit lower than level 10 and +2 from level 11 onwards), the players will also find an oversized magic shogi piece – the “angle mover” (kyō/bishop) – amongst the wreckage of the pagoda (can be broken to channel the greatest shogi player in Carao) and they gain +1 Spirit Emblem.