If you could put desperation on your weapon, what B-skill would you want?

Because as you probably know already, this is now a thing. At first I was really excited, and then I realized that slaying weapon + desperation is probably deadlier on player phase. If you're using flashing/heavy blade, that would enable 3CD specials to fire on every double even in desperation. So I'm looking for justifications, if you will, for desperation weapons.

List of skills to consider:
- Vantage
- Cancel affinity, as suggested by the base kit of S.Linde
- Breakers (juicy wave + swordbreaker might be especially good)
- Def/res link
- Feint skills
- Chill skill (which is probably best on a support unit, which your dagger might be)
- QR (counterintuitive, but anybody who plays anti-mages such as Felicia knows that mages can get too fast to double naturally, making QR very helpful)
- Wings of mercy / escape route. (I play Sothe with escape route for lack of desperation fodder. He's ridiculous in grand conquests - one hit, and he's all over the map debuffing people, sniping squishy mages or damaged units, positioning teammates)
- Flier formation / aerobatics
- Maybe guard, if you have good def and don't want armours to vengeful ignis/aether you back? Should probably just use smoke dagger + windsweep
- wrath, if we get melee weapons with desperation