If you don't have too much problems with unblockable opponents I would suggest the regen path on the left after heimdall, with void/aa/sorcerer or venom it shouldn't be a problem. You have HB and venom to take down the havok, and for the boss I think it's a choice between corvus and venompool (but you might need to rank him up): corvus is faster but VP can solo sentinel without boosts ^_^
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Counters - AA, HB, anyone random, Corvus