Board Thread:Questions and Answers/@comment-28926267-20160706032249/@comment-25958552-20160907092445

Gaster can't be an amalgate cause he didn't had the idea of injecting determenation into monsters. As I made a theory about how gaster died,  I said that he died cause of his Gaster Blaster.

Remember Gaster that died cause one of his invention. Gaster Blaster is that invention I think. Cause Sans is using that to in genocide route. And in Sans Basement,  there is a broken invention that can be the blaster,  and sans repaired it. So Gaster died cause of that weapon.