The spittle is not subject to the buff because it is neither a "bite" nor a "jaws" attack. So it looks like this: Scar-Vet on Carnosaur: Provided he is still undamaged the buff affects the one attack from the Scar-Vet and five attacks from the Carnosaur, rend -1 Oldblood on Carnosaur: Provided he is still undamaged the buff affects five attacks from the Carnosaur, rend -1 Troglodon: It always affects six attacks, if he gets damaged the attack just becomes less likely to hit. (4/2 if undamaged, up to 4/5 if he is almost dead). No rend So the Troglodon does most attacks, but: The Oldblood's CArnosaur does 3 damage with each attack, so that would double to mind-bogging SIX damage. The Scar-Vet's Carnosaur does 1d3 which ends up being 2d3 with the buff, and the Troglodon makes two damage so he gets four.