Traits
Spider Climb
The insect can climb difficult surfaces, including along ceilings, without needing to make an ability check.
Actions
Multiattack
The insect makes a number of attacks equal to half this spell's level (round down).
Poison Jab
Melee Attack Roll: Bonus equals your spell attack modifier, reach 10 ft. Hit: 1d6 + 3 + summonSpellLevel Piercing damage plus 1d4 Poison damage.
Web Bolt (Spider Only)
Ranged Attack Roll: Bonus equals your spell attack modifier, range 60 ft. Hit: 1d10 + 3 + summonSpellLevel Bludgeoning damage, and the target's Speed is reduced to 0 until the start of the insect's next turn.
Bonus Actions
Venomous Spew (Centipede Only)
Constitution Saving Throw: Your spell save DC, one creature the insect can see within 10 feet. Failure: The target has the Poisoned condition until the start of the insect's next turn.