Heart of the Comet steps forward and misses with bite (rolled 19).
Round 423: Icy Mound hits twice (worst roll 22-2=20 for AoM), and does not seem cowed any more. HotC takes 25 bludgeoning damage and 16 cold damage from the attack, but is not held onto (38 vs. 21 grapple). IM steps back to 60N90E. HotC has 54 HP remaining.
HotC bites (rolled 26) for 16-5=11. IM has 19 HP remaining.
Round 424: IM hits twice for 20 bludgeoning and 4 cold damage, does not hold on (rolled 23 vs. 24 grapple), and steps back to 60N95E. HotC has 30 HP remaining.
HotC bites for 15-5=10. IM has 9 HP remaining.
Round 425: IM hits twice for 25 bludgeoning and 9 cold damage. HotC is dying.
Next in round 425 for Chaotic Good is a young chaos dragon (Draconomicon). It has the feats Cleave, Improved Sunder, Iron Will, Power Attack, and Weapon Focus (bite). It has the maxed out skills Concentration, Escape Artist, Knowledge (architecture and engineering), Listen, Search, Sense Motive, Spot, and Use Magic Device.