Writhing Runeblades is an Arcanist Skill, found in the Herald of the Tome skill line.
Base Skill: Runeblades
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Craft a series of Apocryphal runes before launching them at a foe, dealing 718 Magic Damage three times and generating Crux. This ability gains between 1095 and 2191 Weapon and Spell Critical rating and deals 3% increased damage for each active Crux when cast.
Writhing Runeblades is a morph of Runeblades base skill. The other morph is Escalating Runeblades.