Ender Lilies Quietus of the Knights - Playthrough Part 15

Decided to clear any remaining rooms in search of the Stone Tablet fragments. While doing so I discovered an extremely poisonous area that drained all my healing prayers in order to complete. At the end of that there was the last fragment and the corpse of an Umbral Knight similar to our companion. We learned about his backstory - he was part of the ancient warrior clan and after his priestess died he was trapped in the realm because unbeknown to him his pact transferred to Fretia and then to Lily (at least this is how I interpret it). He had a moment of hesitation about whether he should kill Lily (the last carrying the Priestess bloodline) in order to finally be free to die, but he couldn't do it and as he travelled with her he became committed to the cause. Other than that I discovered the last 2 spirits, who turn out to be extremely useful - one picks up Lily and does a forward slide and the other does the same, but with an upward slash. Those two moves allow you to reach previously inaccessible areas. Unfortunately I didn't have enough regular Blight to upgrade the latter, which would've allowed me to clear a couple of more rooms. I presumed that only the hero spirits have platforming functions since none of the regular ones did anything outside of combat and the fact that those 2 are the most hidden is a poor design choice - I could've used those throughout the whole game, but whatever.