sylphie lost her memory how? also is this current time? she doesn't seem to be packing that much "heat".
Anyways Im disappointed again that they skipped the part where she rescued the princess. The last time we saw her use magic was on a bully who she gave healing magic too.
And now somehow her magic is powerful enough to kill Demons!? Come on mangaka. Stop skipping the fights and show us the power growth at least. This manga LOVES skipping every little detail about the characters learning and using magic.