The spell created a beam of blue energy from the caster towards a target creature. If the creature was caught in the beam, a sustained arc of lightning was established between the caster and the target, dealing damage for as long as the caster kept concentrating on maintaining the spell, and for as long as a clear line of sight could be maintained to the target, up to a distance of 30 ft (9.1 m).
- Mike Mearls, Jeremy Crawford (2014). Player's Handbook 5th edition. (Wizards of the Coast), pp. 209–210, 289. ISBN 978-0-7869-6560-1.
- Christopher Perkins, James Haeck, James Introcaso, Adam Lee, Matthew Sernett (September 2018). Waterdeep: Dragon Heist. Edited by Jeremy Crawford. (Wizards of the Coast), p. 29. ISBN 978-0-7869-6625-7.