Harpoons
I used harpoons
monk Boldtusk
I forgot I could use Boldtusk for this trial.
With antidotes, monk Boldtusk 4*+c18 would be better than Rigard 4*+b18 against Friar Tuck ( 2x red heroes). But worse against front bosses blue Boril and yellow Joon since 2x red heroes would be 2x weak / 2x neutral while Wilbur and Rigard are weak / 2x neutral / strong.