Evan

"Uncle Ken, I still can't reach Catalie or anyone, figure it out quickly, it's getting hard to breathe in here"

Ken closed his eyes and shoved all the other thoughts aside as concentrated on the riddle before him

"What can kill all beings, but save us too, too much of it is bad, but not enough is horrid?" Ken was repeating the riddle word by word

"Come on, Uncle Ken"

Elrond was struggling to stand straight as he couldn't breathe in as normal.

"I got it" Suddenly Ken opened his eyes,

"Sun, What can kill all beings, but save us too, too much of it is bad, but not enough is horrid?, it's the Sun" 

Just as he said, the wall crumbled and shook the entire cave 

"The wall, it's moving"

When the wall completely opened, there was nothing but darkness on the other side

"Uncle Ken, let's go"