In the trailer, the Venom
It could be that in the universe of the Venom movies, this type of strong bond is already known among the symbiotes to result in stronger specimens. This could explain why Venom is so fearful of facing an enemy with a ruddy hue.
The main reason was because the Carnage symbiote was not a perfect match with Cletus like Venom was with Eddie.
The bond between the Carnage symbiote and Kasady was stronger than the bond between Brock and the Venom symbiote. Cletus Kasady was also a serial killer and thought of as insane. As a result, Carnage is far more violent, powerful, and deadly than Venom.
The spawn of the Venom symbiote then attached itself to Kasady through his bloodstream. Carnage achieves this by entering Kasady's body through a cut on his hand. This is the reason why Carnage appears as the colour red, as he entered through the bloodstream, which is of course red.
A symbiote is only as strong as the bond that it shares with its host. With that in mind, Venom is the clear winner, having formed a number of strong bonds since making its debut back in issue 252 of The Amazing Spider-Man.
Venom decided that, in order to completely remove the threat of Carnage from the world, he would have to devour and absorb Carnage completely.
Venom is a villain in Marvel's Spiderman. He also known as Eddie Brock. He hates Spiderman because he thinks he is the cause of all the bad luck in his life. Venom is bigger and stronger then Spiderman.
The most venomous snake in the world is considered to be the inland taipan, endemic to central-eastern Australia. It has by far the highest median lethal dose of venom of any snake, and indeed probably any animal, making it the most toxic.
In nearly every iteration of Carnage's character, he is the offspring of Venom. The Klyntar, the race of aliens that the symbiotes belong to, reproduce asexually and can transmit their offspring to other hosts.
Venom felt like an inferior symbiote and needed a host who he could make themselves into better beings. Carnage is the opposite due to the criminal insanity of his host and Venom probably fears that part of him that he tried to control in Brock.
Venom uses the same black goo-like substance that makes up his mass to generate webbing to shoot. As a result, there can be too much of a good thing. If Venom uses too much webbing, it actually pulls from his own body mass, which weakens the symbiote “suit.”
As a Symbiote, Blue was able to bond with virtually any life-form, can emulate its host and even enhance their abilities. The symbiote doesn't need to mate either and can reproduce asexually.
While in prison, Venom produces an offspring named Carnage. (He reproduces asexually, in case you were wondering.) Venom doesn't tell Eddie about it, and Venom and Eddie escape prison. Once they're gone, Carnage bonds with Cletus.
At the very least, a red symbiote is naturally stronger than a black symbiote.
True to his appearance in Marvel Comics, Carnage has the look of a red, Venom-like creature. Carnage aka Cletus Kasady has long been known as one Marvel's most evil villains.
The most powerful of Venom's first offsprings is Scream, an unstable creature attached to Life Foundation's mentally disturbed security agent Donna Diego.
The only truly foolproof weapon against Venom and his fellow symbiotes is the touch of Anti-Venom. Anti-Venom was born when a cancer-ridden Eddie Brock was healed by Mister Negative.
Molten Man is able to generate intense heat from his skin as well as shoot flaming projectiles. As already noted, Venom has two major weaknesses and fire is one of them. Venom wouldn't be able to touch Molten Man without hurting himself, and that's a severe disadvantage he wouldn't be able to overcome.
Most folks are familiar with the fact that the symbiote who would come to be known as Venom first bonded with Peter Parker. It got a taste of the power of Spider-Man and grew to love that power. It grew to love the feeling of the wind on its face swinging through the city.
Venom became one of Spider-Man's toughest and merciless foes of all time, often bringing him close to death. Venom's become somewhat of an anti-hero, wrestling with his morals and even fighting for good alongside Spider-Man.
Venom is an anti-hero in the Spider-Man franchise. He is one of Spider-Man's archenemies later turned rival. The name has belonged to several different hosts over the years, which means that Venom is indeed the identity of this particular alien Symbiote.
By eating Carnage, Venom is effectively returning his spawn back to his former "unborn" state within Venom's mass, not taking anything he didn't already have into his cells.
Venom Eats Carnage - Fight Scene - Venom 2: Let There Be Carnage (2021)
Carnage barely put up a fight. Pieces of the symbiote were on him, but he didn't fully transform or try to defend himself. Venom simply pulled the symbiote off of him and ate it, becoming stronger.