#Which Modifier key do you use the least?
split abyss
pure sky
If it's to open up fancy abilities, I suggest looking at the obscure keys that might not exist at all on normal keyboards, like "compose". (although this one has a specific use, so i'd avoid it)
https://superuser.com/questions/64178/compose-key-on-windows
lucid solsticeBOT
GG @pure sky, you just advanced to level 3!