The Sylgr is a Blue Dagger and a weapon skill in Fire Emblem Heroes. It is the signature weapon of Ylgr.
Grants Speed +3. At start of combat, if unit’s Spd > foe’s Spd, grants Atk/Spd +4 during combat. After combat, if unit attacked, inflicts Def/Res -7 on target and foes within 2 spaces of target through their next actions.