Ritual Collector[Arcana]

requires Ritual Caster Feat

If you come across a ritual spell in written form, such as a spell
scroll or a wizard’s spellbook, you might be able to add it to your
ritual book if it is on the spell list of a class you’ve chosen with
ritual caster and the spell’s level is no higher than half your level
(rounded up). The process of copying the spell into your ritual
book takes 2 hours and 50 gp per level of the spell.

Next Rank /Magesight/