Gelda, like her other vampires, has a two-fold boost in strength at night. She was demonstrated to have ability over fire, having been shown to be capable of creating flames powerful enough to kill Ren. She also has great regenerative abilities and the capacity to conjure and control Darkness, as evidenced in Gelda's ability to build a dome of pure darkness to shelter herself from sunlight and travel during the day. This dome of darkness also offers Gelda an incredible amount of stealth, as witnessed during the Demon King's combat against the Seven Deadly Sins, having entirely disguised herself from their notice, even while she was already in close proximity to them. She was able to escape a beheading by the Demon King after swallowing Zeldris' blood, and she subsequently demonstrated the capacity to enter Zeldris' mind via the blood she ingested from him.
The curse on Elizabeth had been lifted. She got her memories back, and she was a Goddess once again. Who was responsible for this? None other than the Supreme Deity, her mother. Her mother had assigned her a duty. To prevent the Demon Clan's seal from shattering. At least, that's what her mother says she wants, but is it true? The job was difficult enough on its own. Especially since her mother neglected to disclose that her metamorphosis back into a Goddess would render her bedridden for many weeks. During that time, the Holy Knights of the Kingdom seized and took authority of the Kingdom from her father. Things weren't going well, but what more could possibly go wrong? (A rewrite of the 7DS Canon based on the what-if scenario of the Supreme Deity breaking Elizabeth's curse.)
The official Twitter account for the film Nanatsu no Taizai: Hikari ni Norowareshi Mono-Tachi (The Seven Deadly Sins: Cursed By Light) has revealed a short video starring Zeldris and Gelda. It is worth noting that the picture is scheduled to premiere on July 2nd of this year. Members of the Elenco de Voz:

