Sanctum Charm

Charm

After spending a Long Rest in your “Bastion”, you gain a magical Charm (see ""Supernatural Gifts"" in “chapter 3”) that lasts for 7 days or until you use it. The Charm allows you to cast Heal once without expending a spell slot. You can’t gain this Charm again while you still have it.

Source: Dungeon Master’s Guide (2024) p. 346