Merciless in his Albedo form was floating aimlessly, using Ophelia's Ultimate Veil to hide from existence as he withstood an attack of his own making at point-blank range, but because he was hiding from existence itself, any and all attacks, even conceptual ones relative to this current realm, were rendered ineffective.
Truly, in this state, he was truly invincible, if not straigth up unkillable, as only non-existent attacks or attacks that transcend the cosmology of the first realm itself could harm Merciless at this point.
However, since he was hiding from existence, he was unable to engage with others on a physical level, spiritual, and even conceptual level.