Spider-Man: No Way Home contained a secret, subtle Easter egg to Doctor Strange's most powerful mystical relic — the Wand of Watoomb. When Marvel introduced magic into the MCU back in 2016's Doctor Strange, they were aware they were taking something of a risk; after all, their entire universe was built on a foundation of pseudo-science. They worked with a number of scientists — including quantum physicists — to create a model of magic they felt worked well with the shared universe, and thankfully the effort paid off. But, while viewers mostly focused on the magic wielded by Doctor Strange and the Sorcerer Supreme, the film was also notable for introducing the idea of mystical relics — notably the Wand of Watoomb.
In the comics, the Wand of Watoomb is one of the most powerful mystical artefacts ever made, capable of storing and releasing magical energy. It has near-unlimited potential, and according to the sorcerer Xandu, it is "the most powerful weapon in all necromantic lore." That's an exaggeration, but not much of one, giving a sense of just how powerful the Wand of Watoomb really is. The MCU's version of the Wand of Watoomb is briefly seen in Doctor Strange, with Wong choosing it when he prepares to defend the Hong Kong Sanctum from Kaecilius and his Zealots. Although Marvel actually filmed this action sequence, it was cut from the final film so as to streamline the narrative — meaning the Wand of Watoomb has never been seen in use in the MCU.
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Spider-Man: No Way Home contained a subtle nod to the Wand of Watoomb as well — so subtle most viewers would miss it. When Doctor Strange's spell goes badly wrong, he restrains it in a device
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