Appearance
The All-Watcher can take any form it pleases, however it never uses it's forms for their advantages it uses them for the purpose of watching, staying hidden, It rarely uses it's true form but when it does it takes on the form of an eye the size of a galaxy with no Iris or the veins of eyes, a perfectly spherical white eye, its pupil, iris and sclera instead of looking like an actual eye have moving and spinning 1D, 2D, 3D, 4D, and 5D images of everywhere in the multiverse appearing and moving and spinning in them before dissapearing
Purpose
The purpose of the master watcher is to gather all information in existence by any means. It uses its Dominion Beings, The Invisible Watchers to fulfill this purpose
The All-Watcher is a Greater Celestial Entity
Powers
The True power of The All-Watcher is unknown however any attack on it in any form does no damage to it as a shield appears around it according to the attack, for example a sword swing makes a shield line appear and deflect the sword, a lightning spell makes the shield appear above it, etc, there are no ways past this shield and thus no way to harm, or even influence The All-Watcher, because of this any attempt made to put The All-Watcher in The Void fails