Spawn of Tiamat

Spoiler: Greenspawn Razorfiend
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Large Monstrosity
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Armor Class 13
HP 150
Speed 50 ft, swim 50 ft
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Str +4, Dex +3, Con +3
Int -1, Wis +1, Cha -2
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Skills Athletics +7, Perception +4
Immunities poison; poisoned
Senses darkvision 60 ft
Languages Infernal
CR 7 (2900 XP)
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Amphibious. The razorfiend can breathe air and water.
Spring Attack. The razorfiend can take the Disengage action as a bonus action on its turn.
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Actions
Multiattack. The razorfiend makes three attacks: two with its wingblades and one with its bite.
Wingblade (melee) +7: 2d10+4 slashing + 1d8 poison; crit. 19-20
Bite (melee) +7: 2d10+4 piercing
Poison Breath (Recharge 5-6, 20-ft cone): 10d8 poison (Con DC 15 half)


Encounter Composition
Greenspawn Razorfiend

XP Award: 2900

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Needs playtesting to make sure it's a good fight with a solo monster.