Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)

Tantra
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Signature SpellCasting Value: 5+

Tantra is an augment spell with a range of 24". The target unit gains the Always Strikes First special rule until the start of the caster's next Magic phase. The Wizard can choose to have this spell affect all friendly units within 12". If they do so, the casting value is increased to 10+.