The Forge's Devotee

Piety 3+ The Forge trait

You can cast shield of faith with this trait, requiring no material components, a number of times equal to your Intelligence modifier (minimum of once). You regain all expended uses when you finish a long rest.

In addition, you know the mending cantrip. Intelligence is your spellcasting ability for these spells.

The Forge's Votary

Piety 10+ The Forge trait

You can cast heat metal with this trait, requiring no material components. Once you cast the spell in this way, you can't do so again until you finish a long rest. Intelligence is your spellcasting ability for this spell.

In addition, you have advantage on saving throws against being knocked prone.

The Forge's Disciple

Piety 25+ The Forge trait

While you are standing and an effect would push you 1 foot or more, you can use your reaction to not be pushed.

Champion of the Forge

Piety 50+ The Forge trait

You can increase your Strength or Intelligence score by 2 and also increase your maximum for that score by 2.