Spellcasting. The summoner is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The abyssal summoner has the following wizard spells prepared:

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

1st level (5 slots): detect magic, mage armor, magic missile, shield, tasha's hideous laughter

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

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

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

5th level (1 slot): cone of cold

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.