Goro summoned the dark, monstrous entity by concentrating energy with a mysterious hand sign. The attack it unleashed was called "Demon spray," which involved hundreds of tentacles shooting down towards Vegeta and Goku.
Chronoa stated that she forbade "demonic powers" because they were not allowed in her realm. She later clarified that it wasn't "demon powers" but "devil" powers that she specifically prohibited.
This video appears to be a summary or analysis of a Dragon Ball-related story, focusing on the character Ultra Vegito and his confrontation with Chronoa. It details a battle involving Goku, Vegeta, Shallot, Cumber, Goro, and a summoned demon, culminating in a transformation and the emergence of new powers.
The climax of the video involves Goku and Vegeta transforming into new, powerful forms fueled by pure flaming energy (cyan flames for Goku and purple flames for Vegeta). This transformation surprises Chronoa and Whis, as it seems to bypass Chronoa's restrictions on demonic powers. Vegito reveals that the "devil gene" he absorbed long ago is now coming into play, suggesting a fusion with Kazuya's devil form. This new power allows them to easily defeat Goro's summoned monster and then effortlessly take down Charlotte and Cumber, who had been demonified by Goro's power. The conflict escalates as Chronoa attempts to use her "infinity eyes" technique on Vegito, but it proves ineffective, shattering the elder hieroglyph she used. Vegito then reveals that the "devil gene" is the true weakness of the elder gods, not just demonic powers.