Board Thread:Questions and Answers/@comment-27327020-20160404174206/@comment-32392251-20171102134728

Strongest to weakest (MONSTERS ONLY)

All Flowey forms and Asriel forms

Asgore

Sans

Toriel

Mettaton EX (the normal is invunerable)

Undyne (normal and undying)

Muffet

Mad dummy

The dogs

Papyrus