I kinda feel bad for the Master. The fancy 4* knightess was merged into a 1* farmer by mistake, a semi-competent 2* mercenary died right at the start, and three members of the 3* team were killed off without being able to contribute much.
At least we got Edith, and Avant was synthesized into Han...
I wonder how the user sees these unfortunate events, or rather, how the system presents it to them. "Some bad stuff happened, and now all of your premium summons are wiped"? Big oof.