underrated weapon imo. people don't give the range enough credit and the wide tip makes it good for unlocking when necessary (better than most greatswords!!) and the majority of players don't toggle until at least the second hit so there's an opportunity for trickery or a stun bs
i don't particularly care for heater shield (as is this build would be fine without a shield considering how little point there is to one-handing the hammer) but it's there so you can use havel's and switch to giant chest + arms and swap it for grass crest
keep in mind that poisebreak builds up off of hits that have been rolled through, if you're fighting someone with more than 52 and less than 105 poise and you see the lightning effect as they roll one of your attacks they'll be stunned if you get a clean hit on them soon after and often won't be expecting it