Ritual Caster is from the PHB, so it's not free. If you own the PHB or your character is in a campaign where it's shared with you via content sharing then you should see it. If you need to purchase it, you can buy it by going to the PHB page on the marketplace, where you can purchase the whole group of feats from that book, or the individual feat, if you don't want to buy the whole PHB.
The feat has a prerequisite of INT or WIS of 13 or higher. If your character doesn't have that, either that needs to happen, or if it's OK with your DM, you can go into character settings and there should be a slider to turn off prerequisites for feats. If your character does meet the prereq, or that slider is already off, have whoever's controlling content sharing check that their entitlements are in sync and turn content sharing off then on again.
Is the Ritual Caster feat not available on dndbeyond? What materials need to be purchased to access it?
Ritual Caster is from the PHB, so it's not free. If you own the PHB or your character is in a campaign where it's shared with you via content sharing then you should see it. If you need to purchase it, you can buy it by going to the PHB page on the marketplace, where you can purchase the whole group of feats from that book, or the individual feat, if you don't want to buy the whole PHB.
Birgit | Shifter | Sorcerer | Dragonlords
Shayone | Hobgoblin | Sorcerer | Netherdeep
player's handbook is being shared in the campaign I'm in, but ritual caster is still not available.
The feat has a prerequisite of INT or WIS of 13 or higher. If your character doesn't have that, either that needs to happen, or if it's OK with your DM, you can go into character settings and there should be a slider to turn off prerequisites for feats. If your character does meet the prereq, or that slider is already off, have whoever's controlling content sharing check that their entitlements are in sync and turn content sharing off then on again.
Birgit | Shifter | Sorcerer | Dragonlords
Shayone | Hobgoblin | Sorcerer | Netherdeep