Collab Warbond Ideas?

Some I was imagining that would be kinda fun would be Team Fortress 2, Titanfall, Gears of War, and Lost Planet. What are some of your ideas?

TF2: melee wrench that when hitting sentries would prolong their duration.

TF: Mech booster that enables a hell bomb self destruction sequence

GOW: Hammer of dawn ( guided orbital laser), Lancer( chainsaw bayonet)

LP: Valkyrie, fire spitter, vital suit, grappling hook.