You come not from Doppelganger but from Malaugrym ancestor.
Benefit: You gain a Damage Reduction of 10 / Silver. You get a Vulnerability to Silver and Silver attack inflict maximum damage to you.
Essentia: Your Damage Reduction improved by +2 / Essentia. At 3 Essentia the Damage Reduction improved to /Silver & Magic. At 5 Essentia it improved to /Silver & Epic