He's very good for the hydra boss with fear. Beyond that, he does hit quite hard, so he can be useful in arena if built with the right team.

If you want to do the hydra cheese you don't want him to hit hard at all, for the lower difficulties anyways. If you want to use him elsewhere then yeah, make him smack people, great counter to those pesky fear champs in arena. 

for Hydra I want to prepare him, to give him more acc and speed? or switch to savage set, masters I think are good if I didn't have to put Flawless Execution instead of Giant Slayer 

im running mine in a toxic set at the moment and getting ok damage out of him, hes stacking poisons easily on the heads in hydra i might built my 2nd in a savage set to see what damage can get out of that too 

I just rebuilt mine to work a little better with some AoE counterattacks, gonna see how that does. No books yet for him, unfortunately. Previously he was built to slap a lot harder.

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I am pairing him with Battlesage, Sinesha, Big'Un and potentially Fellhound and letting those Fear debuffs triggers their A1 counterattcks,

thanks  :)