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(1d20+15)[31] knowledge religion for the symbol
(1d20+15)[33] knowledge local: Memphis did some research on the grinder so I'm using it as my "local". Also a knowledge history (1d20+15)[21] for famous expeditions that visited the grinder before us and just in case it brings any valuable information I'll roll them all to see if I recall any specific details about the grinder in regards to:
arcana (1d20+25)[39]
nature (1d20+20)[30]
religion (1d20+20)[28]
the planes (1d20+20)[28]
Architecture (1d20+15)[27] (although I probably won't be getting anything useful on this one until I can actually see the grinder with my own eyes)
Dungeoneering (1d20+15)[17]
Geography (1d20+15)[31]
Nobility (1d20+15)[25] (Long shot, I know, but it cant hurt)