He entered the gem
Everything was dark, it was filled with a dark red light
The corruption did not attack, it wanted Jeff to enter it's core... it wanted a battle after years of loneliness
(Picture the "finally a worthy opponent" meme)
He entered the core and saw a massive lemon, suspended by black tendrils and slime
It spoke to him in a distorted, demonic voice
"So, you finally come to challenge me..."
"...Are you finally ready to join me in multiversal domination?"
Jeff was not a man of many words
However actions speak much louder