Giant insect,[1][5][6] also known as giant vermin,[2] was a transmutation or alteration spell that allowed the caster to grow centipedes, scorpions, spiders, beetles, flies, wasps or similar creatures to much larger than their original size. The reverse of the spell, shrink insect, could reduce giant insects down to normal size.[5][6]


Only one type of creature could be affected per casting of these spells.[2][5][6] The older version only worked on true insects, not spiders or scorpions which are arachnids.[5][6] The giant bugs were not hostile toward the spellcaster and could follow simple commands to attack or defend, hold position, follow, etc.[2][5][6]


Only verbal and somatic components, plus the priest's holy symbol were required to cast these spells.[2][5][6]



  1. 1.0 1.1 Mike Mearls, Jeremy Crawford (2014). Player's Handbook 5th edition. (Wizards of the Coast), pp. 208,245. ISBN 978-0-7869-6560-1.
  2. 2.0 2.1 2.2 2.3 2.4 Jonathan Tweet, Monte Cook, Skip Williams (July 2003). Player's Handbook 3.5 edition. (Wizards of the Coast), p. 235. ISBN 0-7869-2886-7.
  3. Ed Greenwood, Sean K. Reynolds, Skip Williams, Rob Heinsoo (June 2001). Forgotten Realms Campaign Setting 3rd edition. (Wizards of the Coast), p. 65. ISBN 0-7869-1836-5.
  4. Richard Baker, James Wyatt (March 2004). Player's Guide to Faerûn. (Wizards of the Coast), p. 91. ISBN 0-7869-3134-5.
  5. 5.0 5.1 5.2 5.3 5.4 5.5 5.6 David "Zeb" Cook (August 1989). Player's Handbook (2nd edition). (TSR, Inc.), p. 217. ISBN 0-88038-716-5.
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 David "Zeb" Cook (April 1995). Player's Handbook 2nd edition (revised). (TSR, Inc.), p. 276. ISBN 0-7869-0329-5.
  7. Richard Baker (1996). Player's Option: Spells & Magic. (TSR, Inc), p. 186. ISBN 0-7869-0394-5.