If unit is within 3 spaces of an ally, grants Atk/Spd/Def/Res+4 during combat, and unit makes a guaranteed follow-up attack, but after combat, if unit attacked, deals 20 damage to nearest ally.
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Sökkvabekkr can be upgraded in the Weapon Refinery. When upgraded, the description of Sökkvabekkr becomes "If unit is within 4 spaces of an ally, grants Atk/Spd/Def/Res+6 to unit and unit makes a guaranteed follow-up attack during combat, but after combat, if unit attacked, deals 20 damage to nearest ally, and also, if unit's Special is ready or unit's Special triggered before or during this combat, deals +5 damage (excluding when dealing damage with an area-of-effect Special), and when unit deals damage to foe, restores 7 HP to unit during combat (triggers even if 0 damage is dealt).". Sökkvabekkr can be upgraded with the additional effect "Accelerates Special trigger (cooldown count-1). At the start of turn 1, grants Special cooldown count-2 to unit. At start of combat, if unit's HP ≥ 25%, grants Atk/Spd/Def/Res+4 to unit and reduces damage from foe's first attack by 30% during combat.".