As said in prior posts, rudimentary prayers is a tier 1 spell.
Afterwards, you can either take Divine Spell Casting if you meet the other requirements or use Learn Spell to learn more spells. Learn Spell’s only requirements for learning 1 additional spell is that your character’s tier is high enough and you know already know 1 spell from its tradition. Basically, a Martial character that gets access to Rudimentary Prayers can at a later tier pick up select spells from the same tradition.
