The character is a 6th-level Warlock (Archfey, Pact of the Blade) and 5th-level Fighter (Battlemaster)

I noticed that his sheet is saying he gets 3 Eldritch Blast beams.

I know that'd be right as an 11th-level caster, but shouldn't it be 2 beams as he's only a 6th-level Warlock?

I know Warlocks have their own odd rules in some cases, but this one had me stumped.

The spell, while only available to Warlocks, is based on overall level, not just Warlock level.

Cantrips scale by character level not caster or warlock level.  So yes as a 11th level character you now have 3 beams.  Yes they are real and yes three beams is amazing.

Well, well, well...interesting stuff!

Thanks so much!