OT has a very bad ZEM but if you stick to soloing sarnak berserkers, the braids quest is solid xp and will get you the OT hammer eventually, which you want
guk top has an excellent ZEM and mobs with a wide level range, also offering good density at every level, some decent stuff like runed bone fork to be found also ..
In droga you could farm
salts, which will eventually lead to some great items for a warrior , its unsure when that content will released though
6 minute bard diet is a nice slack route, though as soon as you can solo a spectre in the feerrot, you should do that instead, its hard to beat xp-wise