30 ft Components:
, up to 10 minutes
You transform up to ten centipedes, three spiders, five wasps, or one scorpion within range into giant versions of their natural forms for the duration. A centipede becomes a giant centipede, a spider becomes a giant spider, a wasp becomes a giant wasp, and a scorpion becomes a giant scorpion.
Each creature obeys your verbal commands, and in combat, they act on your turn each round. The DM has the statistics for these creatures and resolves their actions and movement.
A creature remains in its giant size for the duration, until it drops to 0 hit points, or until you use an action to dismiss the effect on it.
The DM might allow you to choose different targets. For example, if you transform a bee, its giant version might have the same statistics as a giant wasp.
Verbal Component (Alternative):
Little bug that I select, grow in size, my giant insect Class:
SummoningSource: Player's Handbook [5th Edition] (page 245)
View Giant Insect Spell Card
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Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Summoning in Sigil
From Planescape Adventures in the Multiverse, Sigil and the Outlands, "With the exception of permanent teleportation circles, the Lady of Pain prevents spells and other powers from allowing anything to enter the City of Doors. That means creatures and objects from outside in the multiverse can't be summoned or conjured into Sigil by any means. Summoning abilities a character might have, such as the conjure elemental spell or a class feature that summons a companion, still function as normal with these features calling only creatures that exist somewhere within Sigil itself."
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).