My valuntina damage is gone? ? ?

OMG originally wanted to play a mage, but I found that I can't kill people, at most I can only let the enemy's blood remain.
It's really outrageous. I think other people use Valuntina to deal high damage. Is there something wrong with my emblem? I bring the mage emblem."buy equipment at 90% price".

Until the end, I could only come as a support... Fortunately, my teammates are very strong, otherwise I don't know how to win.