something to keep an eye on for investigators that have one stat that is quite high and one that is quite low (eg Gloria Goldberg with 5 and 1 )
it converts a success on a treachery you're able to handle into free relief from a treachery card you couldn't
note that currently every investigator who could run Dreams of the Clay minus Lucius Galloway can already run Ward of Protection, and in my opinion the 1 horror and 1 resource is worth the Spell trait, saved xp, and reduced variance.
Patrice Hathaway might prefer Dreams due to not being able to hold on to her Wards, but it still relies on her (or an investigator at her location) drawing a passable treachery test on the same round as drawing Dreams