This is my first time playing a warlock and I'm still fairly new to tabletop games, so I could use guidance. I know that eldritch blast does 1d10 force damage, and by 17th level, it has four beams when cast.
The PHB description for the Agonizing Blast eldritch invocation (PHB, p. 110) says:
When you cast eldritch blast, add your Charisma modifier to the damage it deals on a hit.
I've looked around and many different areas say add ability score, some people say add modifier, so its all different things.
Let's say my Charisma score is 15 (a modifier of +2). When I roll to do damage for eldritch blast, am I adding 1d10 + 15 (i.e. my Charisma score), or 1d10 + 2 (my Charisma modifier)?