Overview
UMP40 is a self-buffing SMG.
UMP40’s Skill has 2 parts:
- A stacking Evasion self-buff if you don’t activate her Skill. This only buffs Evasion, and with the prevalence of enemies with Surehit, this is just not useful.
- A stacking Damage self-buff if you activate her Skill. This gives her a pretty massive Damage self-buff after 10 seconds, but it requires time to stack up.
UMP40’s tiles are very strange and rather irrelevant. SMGs only have 5% base Crit Rate, so the tiles don't really do anything without the relevant equipment, but if the SMG does have the relevant equipment, then it just overcaps them to the extreme. The main issue is her absolutely terrible Accuracy, and since SMGs cannot equip RMRs, this something you can’t really fix. She’s also an SMG and thus has random targeting.
With these things in mind, UMP40 actually has quite decent damage if you let her sit safely in the backline, don’t bring her against enemies with even moderate Evasion, and don't mind that she targets randomly. This makes her niche at best, and not recommended for general use.