Good catch on the SLAs! We should definitely put those in.
Hmmm, if the SLA/PsLAs make them look that high CR, I wonder if we have glass canons here. I somehow don't think they can last that long against level 18 parties. Compromise and go CR 15, like HD?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.