I highly doubt you will see any errata to Primal Shock. Everything I have heard from PP points to the Mountain King being a completely viable target for Primal Shock. Two fully boosted pow 16/17/18 will be a completely possible thing, but remember that is all of your fury for your warlock. Mountain King will likely be 5 SPD max maybe even SPD 4, which maxes out your threat range with Primal shock at 28" (potentially 10" run + 2" rush, can't factor in eDoomy feat due to order of operations). Have you seen the other colossals? They themselves have 2 Pow 14/15 guns coming off of them at RNG 14 generally, buffable to 18" with snipe, giving them 22" - 23" threat ranges every turn with focus allocation.
There's no reason to errata...
Shred the Gnar(ls)!
Page 5, Warmachine Mk 1. Prime, 2003So play like you've got a pair, or put down the metal and go find something made of plastic.
While I agree that the Mountain King is going to be in the STR 17-18 range, I wouldn't be all that shocked to see Primal Shock get nerfed by restricting it to Large based or smaller beasts. Sadly. PP doesn't love us that much...
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I'm not worried Primal Shock will get hit by the errata stick. More likely they will compensate by giving him a lower STR and more pow like STR 16 pow 4 or something like that.
Either way I'm stoked for whatever they give us at LnL and hope to high heaven its a Mountain King or a Storm Troll instead of someone elses Beast.
I bet its gonna be the SoB's and maybe the storm troll, but I am keeping my hopes in check because then I can't be disappointed.