Marielle the Mermaid is a bonus card for Dungeon Fighter from Essen 2013.
She has the following characteristics:
INQUSITIVE: You get 4XP.
NEMESIS: You deal +4 damage against humans, even if you don't hit the target board.
TRIDENT HIT: If a rolled die borders on more than one area of the target board, you deal the sum of all touched areas of damage.
For more information: http://boardgamegeek.com/boardgameexpansion/150130/dungeon-fighter-marielle-mermaid