Decent output, 5 Block and somewhere in the range of 4-12 area of effect damage usually. Unfortunately it's a bit too slow and its values are a bit too low to keep up with most of the game's tougher fights, so I'm usually skipping it.
The combination of block plus area damage makes this an excellent Act I + II card. Glass benefits especially well from Focus and orb generation, so the more of each that you have the better.
