Snake Archer

Snake Archer is a demon found in Iris and the Giant.

"The arrows of this snake will reduce my maximum Will!"

Location
Snake Archers will replace all Cat Archers when under the Sign of the Snake.

They can also be found in Path of the Giant on Nightmare difficulty on Floors 5, 6, 6B & 14.

And in Path of the Ferryman, they can be found on Floors 10, 11B, 15B & 23 on all difficulties, and Floors 7, 20 & 24 on Nightmare difficulty.

Strategy
Snake Archers can attack you from any range, and will lower your maximum Will by 1 with every hit. They should be defeated quickly because their effect can be detrimental for the rest of the game.