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Crota Movement Timer
Start the timer to kill Crota
0 seconds

Clear the Adds and start the timer when you leave the crystal room hallway (You will hear a roar)

Spacebar will start / stop timer

Credit to Sufinsil for these timings.

Downed Crota when he should be moving? Remove a few seconds from the timer w/ the Remove button.

Other Resources

Crota Loot Table LFG