Sounds unpleasant for the Watcher! But on the other hand, in Fantastic Four #400 I read that Sue Richards cracked a hole in the Celestial Exitar and walked around in his braincase. I do not think that this could happen to a Watcher 😉 .
I read that one of the Watchers battles a Celestial (Exitar) in Fantastic Four #398. I have not read that comic though. I wonder if it was a good fight. If it was at least a reasonable fight it shows that the Watchers are about on the same level. Anyone have that issue?
From Marvel Directory.com:
"The Watchers are a vastly powerful, ancient extraterrestrial race who untold eons ago undertook the task of passively observing the phenomena of the universe. Their homeworld is an unnamed world in an unknown solar system in another galaxy than the Milky Way which is covered with lush vegetation and bears no artifacts of habitation. None of the Watchers live on their homeworld anymore, having taken up permanent residence somewhere within the solar systems they have elected to observe. On the rare occasions that the Watchers convene on their homeworld, they use their advanced technology to create temporary dwellings which they disassemble after use. It is improbable that the planet the Watchers call their homeworld is their planet of origin. If it were, the age of the race would be relatively brief, a fraction of the lifespan of a single solar system still in the main sequence of its existence. Because the Watchers are scattered across the universe, it is impossible to calculate how many of them there are.
Each Watcher possesses vast mental, physical, and energy-manipulating powers. Watchers are telepathic, able to scan the mind of virtually every known form of sentient life and to project their thoughts into any brain. Watchers can alter their appearance at will, assuming any guise they so choose. This is apparently a mental/psionic capacity, and not a physical shape-shifting ability like that of the alien Skrulls. Watchers can convert their bodies into some form of energy in order to "teleport" through space at hyper-light speeds. (It is probably that they traverse warp space to do so.) Watchers can also psionically manipulate energy in the electromagnetic spectrum. The limits of this capacity are not known: it is probably on the same basic level as such Earth gods as Odin and Zeus or such alien races as the Elan. Watchers are seemingly immortal (although degrees of maturity are evident), having bolstered the limits of their life forces with "delta-rays." Presumably an explosion that dispersed all of their bodily molecules thousands of miles would prove fatal. ...
...Other then Uatu, only a few other Watchers are known by name. There is Ecce, the Watcher who witnessed the incubation and hatching of Galactus, and had the opportunity to destroy the future world-eater but did not act upon it. There is Ikor, father of Uatu, the Watcher who proposed the Prosilicus experiment and in penance drafted what became the Watchers' code of ethics. There is Emnu, leader of the Watchers' former world council (now called the High Tribunal), who had opposed the Prosilicus experiment and is now the supreme authority on the rare cases where violations of the Watchers' oaths are brought to trial. Finally, there is Aron, a young Watcher who has not yet been assigned a solar system to observe."