This is DaVinci code for Crystal caves, absolutely cracked maniac anyways. MUST HAVE ALL 4 SPLITS OUT TO ENSURE SPEED! (reason is bcz harb spawns quicker with four)

You don't need these stats they are just the stats that I have and are working for me, it can definitely work with lower stats. (tower booster 7.4k)

Wave 32: 1tb, 1 upper, 1 bomber + hunt, 1 bomber + monk (Must boost auras with the monk guardian, I usually build auras on the right side of crystal, and build all the towers on the left (by forge) so that way I can afk the monk guard on the right side to ensure the buff.

Wave: 33-35: 1tb, 2 bomber + hunt, 1 bomber + monk (ensure everything gets upgraded I just upgrade with my towerbooster, make sure tower boost doesnt go down sometimes spiders are pesky and hit your shit or stun your TB)

It is possible to get sub 6 minute runs self-evident from #going-fast channel on discord me and davinci were able to go sub-6 if you want to speed rounds up make sure TB doesnt ever drop, and mana bombing throughout the wave makes more mobs spawn if you kill them faster. Good luck! <3