Does using a Jagged dagger, used as an implement, get the ongoing 10 damage for attacks, or is it just "weapon" attacks?
Weapon: Axe, heavy blade or light blade
Enhancement Bonus: attack rolls and damage rolls
Critical: Ongoing 10 damage (save ends)
Level 22 and 27: Ongoing 20 damage (save ends)
This weapon scores critical hits on a 19 or 20.