... I forgot about that flail? What is it?
Definitely going for strength for me, no feat
The troglodyte is using a flail with three spiked balls. So it takes the 3d4+3 bludgeoning and 3d4 piercing damage. It's a weapon from a third party source, Revenge of the Horde.
Is the flail a one or two handed weapon? It's too good not to use either way!

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.