Sigmascape V1.0
Strategy
Shoot the train and don’t stand in the AOEs. There’s a stack marker that’s a column rather than the usual roundy bit. Sometimes spotlights will chase you for a bit and then leave a puddle (like the fire in the Ala Mhigo scorpion fight), try to place the puddle on any ghosts in the arena to disperse them.
At some point, someone (a few people? A healer?) will get teleported into a sleeper car with a ghost to kill, shoot the ghost and exit via the clicky. During this phase, the rest of the raid has some adds to clean up.
Then you get to jump up on top of the train and kill a Doom Chimney! Yay!
After the Doom Chimney, you hop back down and everyone gets a debuff that kills you if it stacks too high; face plant into a ghost to clear it (like the suffocating toad bubbles in Rabanastre).
Then you go back to shooting the train and avoiding AOEs and dispersing ghosties with puddles of light.