Potion: greater mammalogy
Pennine Mts.: 12k, 58k
Gristle turns into the largest wolf trophy in the game. He stands next to an ordinary red/purple barguest. The two mobs are linked (in other words, if you pull one they both attack you, even if you're solo). Prior to version 1.70, Gristle was found at 21, 5 in Pennine Mountains.