Yeah I know, run out of time before I can make anything like a tutorial. If you want to give it another go, the idea is to revive the land. Start by switching to the spectral dimension (I just made that name up right now) and cast purify on the flower. Then switch back to normal and start spreading as much grass as you can. At some point you won't be able to spread anymore since the bones are generating dark energy and killing your grass, so switch back to the spectral dimension and start using your spells to fight back and continue gaining ground.