Currently the proc for Vampiric Embrace (VampiricEmbraceEffect) is using the calculation reported by Lucy.
http://lucy.allakhazam.com/spell.html?id=821
Slot Description
1: Decrease Hitpoints by 13 (L1) to 102 (L90)
Should be doing from the Kunark and Velious spdat:
VampiricEmbraceEffect
Decrease Hit Points (HP) from 5 (L1) to 10 (L20) and adds it to yours
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Classes: None
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Skill: Instantaneous
Allowable Targets: Drain
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Resistance Check: Magic
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Spell Duration: Instant
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Spell cast on you: You feel you lifeforce drain away.
Spell cast on someone: Soandso staggers.