You were born under the Birthsign of the Tower and gain the Tower Key power and the Tower Warden power.
Tower Key. As an action you can cast the knock spell without expending a spell slot.
Once you use this ability, you can't use it again until the next dawn.
Tower Warden. As a reaction, when you would take damage from an attack, you can reduce the damage taken. If the damage is reduced to 0, you can send that damage back to the attacker. Roll 1d6 to reduce the damage you take. If the damage is sent back to the attacker, make an appropriate attack roll. If you hit, the damage is dealt to them instead.
Your chances to reduce the damage to 0 increases when you reach 5th level (2d6). 11th level (3d6), and 17th level (4d6).
Once you use this ability, you can't use it again until the next dawn.