Daggers: Sigil of Accuracy or Strength?
Bloodlust.
15 characters
Fire/Air or Bloodlust. Or both.
Also to answer your specific question, Strength.
if you’re power/crit consider not bloodlust but Blood, 30% health steal is good for surviving long fights
This would probably be a good read.
I personally prefer the superior sigil of fire, it does ~1k AOE damage every now and then.
Sigil of blood is also decent, with a 30% chance to steal 480 hp.
Bloodlust and Perception (the 25 stack power and prec ones) are only good in PVE farming. I can rarely maintain a 25 stack in dungeons and WvW.
You can’t stack two sigils of force/accuracy, I would use one of those sigils (probably force), and sigil of air, or if you need more aoe, then sigil of fire, although it does a bit less damage, and costs more. if you want bloodlust or whatever the precision one is called, just have a 3rd weapon (like a yellow dagger or something) you can use to get the stack, then re-equip the proper one in its place.