Huitzopochitl wants to rip your heart out (IC)

[J-H]

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As Sleth dives at the idol, it stabs out with its glowing spear, meeting him with a heated attack that stops him cold.

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Sentinel/PAM-like opportunity attack with a reach of 10'. If you don't have reach, you can't hit with your attack because you're stopped. Speed is reduced to 0 so unfortunately you can't Cunning Action past it. If you see a problem with the wording please let me know. I believe I just copied existing feats to construct the reaction.

Defensive Strike. When an enemy approaches to within 10’ of the Idol, it lashes out with its spear. If the attack hits, the target’s speed is reduced to 0 until the beginning of its next turn.

(1d20+19)[28] for (2d8+11)[21] magic piercing damage and (2d12)[18] fire and (2d12)[11] radiant damage.