>>532607003
That's just a DPS rating if you're trying to use Tess on field. The differences in the effects of Tess's copegun and her signature is massive.
>Copegun Inflicts Frostbite one time after landing 200 shots, once per support skill duration (this Frostbite only does a bit of extra damage)
>Signature Inflicts Frostbite every shot (this Frostbite does damage, increases DMG of every shot and ignores a lot of DEF while active)

Then you look at the description of Tess's Ult and Support skills and you'll see that her sig is mandatory to make Tess function as intended: unlimited Glimmerburst duration inside Realm of Wonder as long as you keep applying Frostbite, and Frostbite that is kept up indefinitely, refreshing the instant it expires every two seconds.
The copegun is nothing in comparison. You may as well equip Tess with a level 1 Icey Dunes.