Golgatha takes 8 points of acid damage from the arrows.
FXF claws Golgatha (rolled 54) for 22-5=17 points of damage, but Golgatha stays on his feet (39 vs. 47 Strength check). FXF also bites Golgatha (rolled 45; best missing roll 42) for 23-5=18 points of damage. Golgatha avoids any other ill effects from the bite (39 Fort save), but is down to 408 HP.
Assuming FXF survives the massive damage roll, he'll take a 5ft-step to follow and another full attack: claw, claw, tail slap, bite, wing, wing. Here's hoping the bite hits again and Gol has the decency to fail the saving throw.
OOC: From my calcs: FXF is at 55n50e and Gol is at 80n60e backed up against the water.
OOC: Infiniti's positions are correct. FXF did not take massive damage, so did not need to make a saving throw.
Round 9
Golgatha takes 7 points of acid damage as the last acid arrow disappears.
FXF claws once, bites, and wing buffets Golgatha (worst hitting roll 48; best missing roll 44). Golgatha does not get knocked down (25 vs. 49 Strength check), but does take 5 points of Constitution drain from the bite (28 Fort save). FXF inflicts a total of 70-15=55 points of damage. Golgatha has 280 HP remaining, and his Constitution is down to 22.
Golgatha bites FXF in the franistan, and hits with a claw and tail as well (worst hitting roll 52-5=47; best missing roll 45-5=40) for a total of 101+20-15=106 points of damage. FXF has 51 HP remaining.