Dereks listens to the others, <<Guess I'll take the angel>> with that he flies closer to the angel, always remaining in his hidden state. When he get's close enough he tries to draw the air from it's lungs, choking it to death.

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Using Suffocate if I can get close enough to do so in one round.
The fort save is 21 DC=10 +1/2 HD +My Con Mod