It ignores his passive, got wiped today because of it. Not sure about celestial.
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This appears to me when I am using VHE or Celestial - the damage returns to me. Not sure about the Talisman the other team weared, probably there is a way to get behind Van Helsings passive. When I attack VHE or celestial in PvP the other team arrives no damage. Passive had not been disabled, as far as I had seen this. Enemies in PvP using VHE or celestial usually take no damage when they hit my starfire... so, it is a mysterium to me as well.
To be honest - I donīt use it while attacking very often, but my defense team (except that event team I use at the moment) wears it and I donīt have many losses on it - probably a PvP-defense-only-Talisman ;)
if you can't avoid hitting the character with the starfire, make sure you hit softly on it..this won't kill you
Van Helsing and Celestials negate the damage done by starfires