Scarred

You have seen many horrors in your adventures. As such, you have become hardened to sights that would disturb other adventurers. But some horrors bring back those most nightmarish of memories, which you have tried so hard to forget.

When your character takes psychic damage, roll 1D20. 

1: "Oh god the horror!": You take double psychic damage and are Stunned until the start of your next turn as you experience an horrific flashback.

2-19: "I've seen worse!": You only take half psychic damage

20: "I fear nothing!": You take no psychic damage at all