lowest his trample has done to me is 1k on a crit, and only way itd do 400 is with mana shield tanking, being it breaks mana shield and still does 400 damage to u, only way i can see it happening, and for most of monsters in trials, barrier spikes is best defense against solas, reaper, and glas, i posted video of my runs in tanis trial thread, using barrier, firebolt up to lich, then somersault wotg to destroy lich, then glas, i did slow magnum way, but been using more aggressive barrier and guns to speed it up(magnum is safe, but takes~20 mins, aggressive guns method only took me ~10