During the Stephen King's 'Dark Tower' series, a main antagonist, the Crimson King, is portrayed as an enormously powerful being, capable of destroying the whole multiverse:
"I am the Eater of Worlds"
However, when Roland finally meets the Crimson King,
he turns out to be an old man with a white beard and red eyes, who fights by throwing grenades from his prison in the Tower.
Isn't this a bit disappointing? Did Stephen King have any special reason to present him in this way? Did he ever explain it in interviews, or in other books?