Twin Divinity; Rocksteady Retaliation

You imbue to objects with the power of Tyr and Orogann respectively, spending an action and 2 spell slots to do so. The spell lingers untill triggered by the user, spending 1 reaction to actively trigger it themselves. Does not trigger automatically. 
When triggered, the user reflects all of the damage taken from a physical hit back at the attacker, and takes half damage in the process.

If this spell is used with 2 of the casters second highest (2nd level minimum) spell slot level, the damage is completely negated.

This spell can only be used once per long rest.