Led Zeppelin IV #7 Going To California (backward lyrics in red)

2m47s "Hey Arise in the power of this room beam"
These likely refer to the fact the band burned old banisters to create heat. The house was damp and cold and it's likely true the heat was needed however it's also likely true the fire was used as a source of energy for the rituals that were likely conducted. (Led Zeppelin IV | Full Documentary | 9:15 | https://www.youtube.com/watch?v=-2ccaDGJleY&t=555s )