This is a direct follow-up to this other question of mine and assumes that, indeed, one may wield a Talisman of Pure Good (or a Talisman of Ultimate Evil) as an improvised weapon and apply both the regular melee damage from an improvised weapon plus the Talisman's radiant/necrotic damage if the creature is not of the right alignment.
The Player's Handbook states the following about Knocking a Creature Out:
Sometimes an attacker wants to incapacitate a foe, rather than deal a killing blow. When an attacker reduces a creature to 0 hit points with a melee attack, the attacker can knock the creature out. The attacker can make this choice the instant the damage is dealt. The creature falls unconscious and is stable.
Can one decide to strike a maligned foe non-lethally (and therefore knock them out instead of killing them) with a Talisman of Pure Good (or Ultimate Evil)?
My hesitation relies on the fact that the radiant/necrotic damage from the Talisman does not directly come from the melee attack, but rather from the item. I think it might still work, but I am unsure.