[jojolagger]

Colt Darts to AE 17 and Fires a Missile at the hydra, Intending to seriously wound it.

Spoiler

aiming at the bit of hydra in AF23 so the blast is safely away from john.
(1d20+9)[15]
(2d6)[5] For hit
(2d6)[11] AoE
Also, assuming hit, no save, pushed away from me to the edge of the area.

Also, accounting for it's cold vulnerability, we've dealt (33+6+4+16) 59, or 43 after fast healing.