Except for the first cultivation session, where Ethan absorbed the Death Essence to get Life Points, he started converting it into Golden Essence, which is the liquid form of the purest Spirit Essence for the Cultivators.
As for why he preferred Golden Essence over the Life Points, it was because he was using it to nurture his Obsidian Spirit Root.
[The Death Essence is converted into Golden Essence and it is rapidly absorbed by the host's Obsidian Spirit Root]
The Obsidian Spirit Root is a Special Rank 7 Spirit Plant that Ethan consumed to replace his Mid-Grade Spirit Root, and upon successfully nurturing it to maturity, his Spirit Root would turn into a High-Grade Spirit Root.
Unlike other Spirit Plants that get tired for a specific time of nurturing, this Obsidian Spirit Root is tireless and could absorb the Golden Essence to grow faster.
'Although Life Points are valuable, having a High-Level Spirit Root is more important to me.'
