If cutting words is used on an AoE effect like fireball, does it reduce the damage?

If Mage Armor doesn’t count as armor then would a Monk get AC 13+Dex+Wis?

Counterspell & Dispel Magic : I know or I don’t know the spell’s level of the opponent spellcaster?

When the monster Manual list a specific save do you add that to the monster’s stat bonus?

Does balor’s Death Throes apply only when it dies in the Abyss?

Would a spell like ability count as a spell?

Eldritch Blast can’t cast on objects, how do you justify this with flavour?