Usha

Spellcasting. Usha is a 14th-level spellcaster. Her spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). She has the following wizard spells prepared:

Cantrips (at will): fire bolt, light, mage hand, prestidigitation

1st level (4 slots): detect magic, mage armor, magic missile, shield

2nd level (3 slots): misty step, suggestion

3rd level (3 slots): counterspell, fireball, fly

4th level (3 slots): greater invisibility, ice storm

5th level (2 slots): cone of cold,  immolation

6th level (1 slot): chain lightning

7th level (1 slot): teleport

Venom's Bite. (Dagger) Melee or Ranged Weapon Attack: +7 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.

The poison on this dagger remains for 1 minute. That creature must succeed on a DC 15 Constitution saving throw or take 2d10 poison damage and become poisoned for 1 minute. The dagger can be used this way 3 times a day, and recharges at dawn.