I'm currently in the process of recording guides for speedrunning the bosses in Valhalla mode with live commentary.

Part one with Jera's walkthrough, where I manage to beat Jera in 39 seconds in game time, is already uploaded here:

Part two with Fé's walkthrough can be found here:

I'll edit with more as I make them. They take me a while to record though because I'm pretty bad at playing and talking at the same time.

My Steam Community Profile: http://steamcommunity.com/profiles/76561198199224154/ Feel free to add me to talk about strats for any of the bosses.

Once I have recorded all 6 tutorials I'll put them together in the guides tab, but for now I'm going to leave them here.

P.S. If any mods read this, it would be great to set up individual level leaderboards for boss fights that use in game time for Valhalla mode.

why this is not in the guide post of the game?

I'll make a guide post once I have guides for all 6 bosses.