Absorbing veins

Absorbing Veins was an ability demonstrated by Kain in Blood Omen 2. Each time Kain defeated a 'traitor' vampire in a boss battle, he was able to "absorb their veins" and thus gain new Dark Gifts.

Umah first taught Kain about this ability in the prologue before Chapter 1:The Slums, telling him that if he should be victorious in an encounter with the vampires that served the Sarafan, then he would be able to "absorb their veins and thus gain new abilities"; new Dark Gifts.

Kain was able to use this ability on four occasions; On each occasion an glowing and sparkling outline of humanoid shape would 'rise' from the victim, eventually being drawn into Kain.
 * Taking Jump from Faustus after his boss encounter in Chapter 2:The Smuggler's Den
 * Taking Charm from Marcus after his boss encounter in Chapter 4:The Upper City
 * Taking Berserk from Sebastian after his boss encounter in Chapter 6:The Industrial Quarter
 * Taking Immolate from Magnus after his boss encounter in Chapter 8:The Eternal Prison