The last campaign I killed the BBEG and his pet dragons in one round... I was playing a venerable Druid/Shifter/Warshaper (I think I was level 17 at the end), and using the assume supernatural ability feats I first shifted into a Solar and gave my party the various cleric buffs of win, and then proceeded to shift into a 17 headed pyrohydra, as the DM had previously ruled that there were more then 12HD hydras out there. So we walk in and exchange pleasantries, when the DM decides the BBEG is "tired of playing with us". So he summons two adult red dragons for us to play with and stands back. The dragons go first in initiative, and proceed to charge at the party using pounce (yay for tiger dragons
). Of course neither one decided to attack the hydra... so thats 34 (Haste FTW) AoO I got... and therefore two dragons fell over dead.
Next came our resident wizards turn, he tried to PaO the BBEG into a newt, and seeing as the BBEG was a 25th level fighter (asked the DM after) it would have worked, other then his spell reflecting shield. So with our wizard taken down it proceeded to be our rogue and BSF's turn, and well lets just say they weren't the most successful at killing
. Finally it comes to me, I take my 5 foot step and full attack, biting 34 times at the poor poor BBEG. With the associated buffs and high strength of the hydra, I hit on a 5 or higher... so of course I miss nearly 30% of the time instead of the assumed 20% and never crit
, but still ended up more then doubling the BBEG's HP.
I do feel bad for the DM, the whole shifter thing was so I could turn into a Lammasu for most of the campaign, but he had to rule that Haste gave every Hydra head an extra attack... poor guy