Venom’s presence in NWH acknowledged the existence of symbiotes in the MCU. However, the Eternals had already created the MCU’s first symbiote prior to No Way Home’s appearance. New events, concepts, and characters are being introduced to the MCU as it enters its fourth phase. Furthermore, it is at the center of that era, that is, the multiverse, which serves as the backbone of the new era.
The post-credits scene in NWH brought a piece of the Venom symbiote into the MCU. This confirmed that Spider-Man and the characters from Sony’s Spider-Man universe are part of the multiverse. At the end of Far From Home, Peter Parker asks Doctor Strange to cast a spell that will make everyone forget that he’s Spider-Man. This is where NWH picks up from. When the spell goes wrong, the multiverse’s gates open.
This allows characters, including previous Spider-Men from prior Spider-Man films, to join Holland’s Spidey in the MCU. In the post-credits scene, Eddie Brock and Venom also visited the MCU. Here Venom left a portion of himself in this realm. However, Eternals established the first symbiote in the MCU before Venom did.
Kit Harington’s Dane Whitman becomes the Black Knight in the comics. Here, he also possesses the Ebony Blade. In the MCU, the character first appeared in Eternals alongside the title team and the Deviants. While his transition was not directly shown in the movie, it was hinted at in the post-credits sequence in Eternals. This is where Whitman unlocked a box containing the sword and prepared to use it to carry on his family’s tradition.
When Dane comes close to touching the sword, it reacts strangely, as a symbiote would. This indicated that Eternals was the first time symbiotes appeared in the MCU, not the post-credits scene from NWH. Using the Ebony Blade, Merlin and Sir Percy forged a weapon that could cut through anything, prevent its user from dying, and block any magic. However, this came at a price. The blade bears a curse that inexorably taints any user, resulting in a desire for bloodshed, violence, and fatality.
This divine weapon, according to the symbiotic god of darkness Knull, has the power to destroy the entire world. It can only be wielded by those with an impure heart, pulling out their negative emotional states until they become frantic for destruction. There is a lot of curiosity about how the effects of the Ebony Blade’s symbiote compare to those of Venom’s. Another question that arises is how the MCU might make use of the various powers it confers.
If Dane Whitman appears in the MCU again, it’s possible that he will be a part of the Venom family. It’s also possible that Whitman could return to the TV show Moon Knight or until the solo film of Blade to show how his transition into Black Knight is going and the effects of the symbiote in the Ebony Blade on him so far. Whitman’s future as Black Knight is now tied to Blade, so he could come back at any time until the solo film of Blade.