Source Starfinder #1: Incident at Absalom Station pg. 53 Item Level 6 A weapon with the spellbane fusion gains the spellbane critical hit effect. A target affected by the spellbane critical hit effect must succeed at a Will save (DC as normal for a weapon of the given item level; see page 181 of the Starfinder Core Rulebook) or be unable to cast spells or use spell-like abilities for 1d4 rounds. If the weapon already has a critical hit effect, you can choose to apply either the weapon’s normal critical hit effect or the spellbane effect when you score a critical hit.
If a spellbane weapon also has a fusion that allows it to bypass damage reduction of a specific alignment (such as an unholy weapon’s ability to bypass DR/evil), its spellbane critical hit effect works only against creatures with the diametrically opposed alignment (for example, good creatures in the case of a spellbane unholy weapon), but the save DC of the spellbane critical hit effect increases by 2.
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