So about the Elder Sword...,
I really like it.
The Predator has a perk which boosts melee damage strength so if you rush the enemy you can get in some quick kills with it. The Fireteam is conditioned to look up since the Predator primarily uses the trees to travel so rushing someone on the ground or getting in a swipe while they're running away is always good.
Just ran a match doing that and I really like it. Also anybody notice the Predator's laughter going 150% at the end? What I mean is I can't tell if it was someones mic or the Predator because the laugh went from a laugh to "AAAAUGGGHHHHH" right at the explosion and I've never been prouder of this thing overacting. Currently it seems pretty common for the Predator to nuke everybody but I think I have my favorite self-destruct now.