Fun fact, Vecna — who is now a household name thanks to Stranger Things 4 — is one of the greatest villains in D&D and he was a lich who ascended to godhood.What would a fantasy movie be without its creatures? Rather, what would D&D be without dragons? It's literally in the name.
Each type of chromatic dragon is also associated with a specific element and for black dragons, it's acid — and that's the steaming stream of goo that you see raining down on the battlefield.Mimic - a shapeshifting predator which can take on the form of inanimate objects to lure prey and are nearly indistinguishable from the original
In a scene where people are bouncing off a force field, that looks to be Shield. While it temporarily increases your armour in the game, thereby making you harder to hit, the film seems to be using it differently. When Rege's massive sword starts glowing with runes, that's probably a spell called Holy Weapon or a Paladin ability known as Divine Smite. Both have similar visual effects but what fans might be more excited for is the latter as that's what Paladins are mostly known for.
We also see, in quick succession, a lightning spell and a fire spell. Of course, there are a plethora of spells associated with those elements but the most popular ones are Lightning Bolt and Fireball — both of which have been a running gag among longtime players.The shield that blocks the fire, though, might very well be Shield or Wall of Force at play, but it could also be a creative use of another common spell called Counterspell. As the name suggests, it negates the activation of a spell.