The actual material is a thick sheet of ice. I was thinking glass but I don't think the health value can be set high enough with glass. Maybe stone will work?
LCDLC Mapmaking Dept.
Maps finished: Hellhouse, Sorry, Worrior 1-20
Maps modded: CubeOrigin
Maps in release candidate: Blockforts, Cannons 1, Hotzone, Icecastle
Maps in beta: Arctica, Cannons 2, Cerulean-River, Igloo, Skygarden, Spacestation
Maps in alpha: Merlin, Totem