Easiest way across: Once platforms start appearing, they spawn and despawn in a static order. Stand on the edge of the ledge, wait for the [b][u]third[/u][/b] platform to appear, then jump to the top of the block on the platform, before it despawns, run and jump towards the wall where you need to go. You'll begin to fall, but be close enough to the back wall that your jumps/glides will push you towards your goal. Save your [b]jumps[/b] (hunters), [b]glides[/b] (warlocks, titans) until you are low enough that you will not take much fall damage. Sounds more complicated than it really is...little practice, and you'll make that jump together every time as soon as you come out of the cave. Good luck gents!