I couldn't find any other posts discussing this so I thought I'd start it.
Currently Warlock's Reading Spellbook + Release doesn't work with any SP usage reduction gears, like Pharaoh Card or Geffen Magic Robes.
Would be great if this was fixed, since Comet uses 800 SP!! I'm hoping this is something iRO can fix, rather than needing kRO to fix. :/