I have a terrible memory, I'm thinking 15 is when I did it?

But ya, the rock elementals, toss one LB to pull, drop fire totems, flame shock x5, and melee x5 till dead. You will run into this just about every time you have to fight an elemental. I think the rock guys in Maraudon where the worst so far for me. They travel in packs, always seemed to show up when I was low on mana already until I learned their pattern, and then they break down to mini ones when you kill them, so, lots of shocks, fire totems and melee is the order of the day.