Spoiler: Concentration
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DC 18: (2d20b1)[13]+x


The monstrosity thrashes as the T-rex bites into it. As the onslaught of smaller dinosaurs approaches, it surrounds itself with a magical shield, stopping the most of the ravenous velociraptors.

Spoiler: OOC
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It does not flee because it has already used its reaction to cast Shield. AC is 17 + 1 per live elemental (+5 from shield).