Well, in terms of our tome the morrsarr are the only units with a really good rend on more than one attack / damage, not counting the king. The alopex has rend, but we already soliloquized why that is bad on almost every bloody page. Sure, you can take the non strong stuff in your army, but chances are unless you agreed beforehand your opponent will bring their strongest stuff, so it's kinda unfair to handicap yourself like that.