Valda's Spire of Secrets
Transient Bulwark
1-level Abjuration
Ritual - does not require spell slot, takes 10 minutes longer
Casting Time: 1 action
Range/Area: Self
Components: V, S, M
Materials: a pearl worth 10 gp, which the spell consumes
Duration: 8 hours
The next attack made against you within the duration has a -10 penalty to hit.