Spark

Sparks are a type of lightning or arcane elemental creature that appears in certain places where magic is prevalent. They tend to have a specific purpose, such as healing or buffing a boss, exploding, or summoning adds. It is unknown if they are sentient or just an advanced form of spell that is cast by powerful arcane beings. Sparks should not be confused with wisps, which are ethereal nature spirits that have a superficial resemblance to sparks.

• Astral Flare, cast by The Curator in Karazhan
• Astral Spark, cast by Arcane Protectors in Karazhan
• Chaotic Rift, cast by Anomalus in The Nexus, but also spread out across the rift spawn area of this dungeon
• Charged Sphere, cast by Storm Tempered Keepers in Ulduar
• Ethereal Beacon, cast by Nexus-Prince Shaffar in Mana-Tombs
• Planar Anomaly, cast by Ley-Guardian Eregos in the Oculus
• Pure Energy, cast by Vexallus in Magister's Terrace
• Power Spark, cast by Malygos in the Eye of Eternity
• Spark of Ionar, cast by Ionar in the Halls of Lightning

The name "spark" is based on NPC names as no other name is known.

It is possible that these creatures are in fact spark elementals or spark sprites, although there is no evidence for or against this so far.