Aura Extension

Aura Extension is the Semblance of Gwen Tennyson.
Mana is the name of the nigh-identical Semblance of Hope Spellbinder.
==Description==
Gwen's Semblance allows her to use her Aura to generate constructs such as energy blasts or force fields. An obvious downside to this is the amount of Aura drained from her when she uses the Semblance, meaning she'd run out eventually.
Three of Gwen's talisman Charms alter her Semblance in some fashion. One amplifies the healing aspect of her Aura, the second increases her overall skill with using her Semblance, and the third amplifies the abilities of all the other Charms along with the power of Gwen's Aura Extension.
The other three Charms utilize Fire, Lightning, and Gravity Dust respectively, and Gwen can apply those Dust types to her Constructs.
===Mana===
Hope Spellbinder is capable of using a Semblance nigh identical to Gwen's, though it is more powerful due to her Alpha Rune weapon. Her constructs are also purple due to her Aura color.
==History==
Gwen used her Semblance in her sparring match against Blake Belladonna in Trix Up Their Sleeves. Gwen was initially seen trying to hit Blake with Aura Construct blasts, failing due to Blake's own Shadow Clone Semblance. Blake then swung around to try to get a hit in from behind, but was blocked by an Aura force field. Gwen's part of the training montage ended when she went at Blake with an Aura blast powered by Fire Dust by one of her Charms. 
==Trivia==
*Gwen's Semblance was the trickiest one to think of. Magic, while related to Semblances, is an entirely separate beast that only a select few individuals are capable of using on Remnant, so she couldn't simply be given magic as a Semblance. However, as a nod to Gwen's canon magic, Blake Belladonna did semi-jokingly refer to Gwen's Semblance as magic.
*Gwen's application of her Semblance, as well as the pink coloration of her Aura, are direct nods to the way Gwen uses Mana starting in Alien Force.
*Gwen using the Aura Extension as a force field is a happy coincidence with the way Jaune Arc describes Aura as "like a force field."