Glass cannon 10 dex 4 con dodge builds are the easiest way to beat that fight and the game in general.
In block builds you need to have some constitution because not every time you will get a perfect block roll, dodge will always dodge the damage, no matter the roll. If you get a better roll on dodge you counter attack. It's pretty unbalanced but I'm having fun playing a Mercenary Imperial Legionnaire that's 10/6/10/6/4/4 and block based. My body count is right now ~50/60.
Kinda stuck after I convinced the dux to take Meru's side instead of Gaelius' side and now Meru said find the temple but there's no way to actually find it so I dunno where to go.