Tassarion to finish the round.
Already 24 dmg to the thing and it may be prone to boot.
As these were to be fun test campaigns a question for all out there.
Given an average CR (lvl equal to party STR), are one big creature encounters more challenging than a bunch of smaller monsters to you as a player. I know there are a bunch of factors in how you would play it, but I thinking overall, have you found overwhelming numbers more or less of a challenge than say the big bady with a bunch of attacks.
This encounter could have easily been a group of harpies, and I wonder now if that wouldn't have been a bit more of a challenge, especially with the day about to end and the group at full strength.