Please continue the naming convention of "quanta".
I am not sure what benefit can be derived from that relaxed cost mechanic that is not already provided by the pseudoquanta mechanic.
However I am not all seeing.
I'll still think OldTrees is omniscient even if there are humble comments.
I really like the idea of combining the Underworld art with elemental marks, though what's odd is that in some of the cases the Underworld symbol does not stand out as much as some of the other elemental marks. I'd suggest that they be adjusted such that the Underworld symbol be as prominent as all of the elemental mark combinations.
,
,
, and
almost have their Underworld symbol non-existent.
Also, how would these symbols appear when they are the normal, smaller size? Would they be distinguishable from the normal elemental symbols?
Aside I would also agree that the mechanic you present seems a little like a fusion between
and and element. It seems a little redundant with ideas already in existence, and I, personally would prefer a different mechanic.
Good job with the creativity though.
EDIT: Also, should you want your pseudoquanta to be added to the OP, confirm the functionality of your idea and make small symbols.