Duo paths in The Shadow Crypt
If you're not soloing the Shadow Crypt the old standard routes for The Shadow Crypt aren't that good. They don't use the fact that there's more players running fully. Neither are a few of the other routes I've seen in circulation. For pure XP(/minute) you want to get 8 gears ASAP and end up on the ramp at the end of the paths with the players carrying these. This assuming there's no need to shrine.
Therefore I decided to construct paths for two players ending up with exactly 8 gears on the ramp at around the same time. No intersecting paths, except for the banner room at the end of course. I also avoided the green maze.
There may be better paths, but these work well for two (or more) players.
Player 1 goes east (fireball (spell/wand) the door), while player 2 does the fight at the start. Three instances as we all know depending on the color of that room. The players meet in the banner room and goes to the ramp from there.
Note that player 2 always goes west at the start.
All three paths have been tested. The two players will normally arrive at the banner room at around the same time. If not, the trailer will probably catch up while the other gets the final gear or during the ramp-fight.
Player 1: (E)NNSEW
Player 2: WWEWW
Player 1: (E)WWNEW
Player 2: WENEW
Player 1: (E)SNSEE
Player 2: WSEEE
Player 1: (E Red Attic), N Blue Attic, N Green Pyramid,
S Blue Maze, E Red Pyramid, W END
Player 2: W Green Attic, W Yellow Maze, E Yellow Pyramid,
W Red Pyramid, W END
Player 1: (E Green Attic), W Yellow Pyramid, W Green Torches,
N Blue Pyramid, E Yellow Water, W END
Player 2: W Blue Attic, E Red Water, N Red Torches,
E Yellow Water, W END
Player 1: (E Blue Torches), S Yellow Maze, N Green Water,
S Red Pyramid, E Green Torches, E END
Player 2: W Yellow Water, S Blue Maze, E Red Attic,
E Green Torches, E END
I hope this will be of some use.
Edit: Tested all paths and added some additional info.