This is a life-draining attack.

Innate Attack (Toxic) 0d+12 [55] 
    Delay (Triggered) [+50%] 
        Spell doesn't truly start until the effect is used the first time 
            Then it lasts 1 minute 
    Cyclic (4 cycles at 1 second intervals) [+200%] 
        Can be stopped by healing 12 or more HP 
        Neutralize (Magic) on caster or victim also works 
    Aura [+80%] 
    Works Through an Attacker's Melee Weapons [+50%] 
    Melee Attack (Reach C) [-30%] 
    Resistible (HT-4) [-10%] 
    Terminal Condition (Neutralize (Magic) on Caster Stops Cyclic) [-10%] 
    Magical [-10%] 
    Spell Components [-40%] 
        Must say "shroud" in Latin 
        Must gesture with hands 
        Must hold dust or ash from an undead with life draining powers