Omni-X

Ben finally beats Vilgax, but with a huge cost. All of the people Ben loves is dead, Gwen, Kevin, Julie, his parents, Grandpa Max, there all dead. With Ben all alone with Ship at his side, he becomes depressed until he is transported to another world where he gains another family, will he learn to trust and be happy again or will the past come to haunt him.

I got this idea from another story, but I forgot their username thing but credits to them. It has the same themes as them but different plot and worded differently.