Zapish Persuation. This Zapish mage has some lightning based advantages. Any spell they cast that deals damage deals an additional +10 lightning damage. They have resistance against lightning damage and can cast 5 lightning bolts a day without needing material components nor expending a spell slots.

Zapish Zaps Zapishly.  As an action the mage may attempt to take away a targets lightning damage resistance by bestowing a curse on them. The target must make a dc 16 constitution saving throw. On a failure their resistance is removed for 1 hour. On a save the mage's own resistance is removed and they are dealt 10 lightning damage. The curse can be removed by a lesser restoration spell.  

Spellcasting. The mage is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 16, +8 to hit with spell attacks). The Zapish Mage has the following wizard spells prepared:

At will:

5/day; lightning bolt

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

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

2nd level (4 slots): misty step, suggestion

3rd level (3 slots): counterspell, lightning bolt, fly

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

5th level (2 slot): cone of cold

A Zapish Dagger. Melee or Ranged Weapon Attack: +5 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage plus 7 (2d6) lightning damage.