Heroscape Expansion XI D&D Warriors of the Ghostlight Fen By Wizards of the Coast Collection D1;

Nightmares from the Swampy Darkness! The many heads of the Fen Hydra writhe and strike outward in a tangled fury. Each of the beast's four heads is like an opponent unto itself. The Sahuagin Raider catches the coppery scent of blood in the water. The smell drives him into a maddening frenzy. His razor-sharp teeth gnash at the wounded prey. The incorporeal forms of the Phantom Knights shimmer in the moonlight. They drift effortlessly about the battlefield. Their enemies attach pass right through their ghostly bodies with little effect.