Actually elder brains in 5E are kinda weak. Larian invented a lot of bs for BG3 but by rules elder brains are kinda defenseless and rely on mind flayers to weaken enemies so that it can even attempt to read minds or implant suggestions. On their own they cant really read minds or dominate others unless in close proximity.
Any of the giths red dragons would in most cases wipe the floor with the brain.
Wow, really? I’m familiar only with 3E lore about elder brains, and their challenge rating was 25+… more than Ancient Red Dragon, on par with top demon lords and arch dukes. Yeah it has no physical might, but it’s an epic level spellcaster with catastrophic psionic power. You have to take on that plus all of the top dogs protecting the brain like ulitharids and alhoons.
And our milf loving shoemaker first walked in Mephistopheles vault (it is soo bad how he describes it in his journal, literally: “so anyways i was burgling the Crown of Karsus from the vault and noticed a cute book called “the grand design” which described some illithid ’s plan for world domination, soo i took that too, noice”. And then he walks into an elder brain chamber and puts the crown on it. Ez pz lemon squeezy.
Who even came up with that ?