Haste, slow and snare, mana regen = can’t be modded.
https://wiki.project1999.com/Cassind...rus_of_Clarity
(Fine print)
Svs (and OOS), runes, damage shields, health regen, dots, directs, stats, run speed = can be.
I can’t recall effects of faction songs, mana drain, lull and the other niche ones.
I know there are some singing resist songs that the epic mods a ton without another option except Puretone. Psalm of cooling and warmth (fr or cr + DS) and song of mystic shielding (mr plus some other stuff). And the desperate dirge.