What Is Starlights Cutie Mark?

Starlight's Cutie Mark seems to be similar to Twilight's cutie mark being it shows magic. Starlight has been shown to be able to master magic she did use magic that she "practiced" for a long time on Twilight but it had no effect. But we never see Starlight use her magic to do advance spells until the final moment.

What does Starlights cutie mark mean?

Starlight Glimmer is a very powerful unicorn. From her true Cutie Mark, it can be presumed her special talent is magic. Her signature spell is the ability to drain a pony's talent by stealing their Cutie Mark, replacing it with an equal sign that inhibits their abilities.

What is Starlights talent?

According to director Jim Miller, Starlight "has a talent for magic as well and is a proto-Twilight character.