Raising Canaan to become Canaan/Nekhbet, a full fledged Divine Pseudo-Servant, allowed her to take on the task of observing the world or at least the most necessary parts. In those few moments she is able to do it, Watcher can use his authority to change his container to Ancient God | Assassin and fight to his hearts content...and finally unsheathe his daggers.
Hu & Sia
Daggers of Creation
Hu and Sia were the personifications of aspects of Atum, born when he created the universe. They appear as deities during the time of the New Kingdom, but they are concepts crystallized as daggers for him.
Hu is the primordial utterance, the first word of creation, with it the earth was born. As Atum he could 'see' things and concepts into existence. Hu is the tool that allowed him to bring those things into the existence we inhabit today. With a slash of his dagger Hu, he can create concepts like 'weakness' in an enemy or 'immunity' for allies. Every concept that could be imagined as 'possible to be created' can be and likely even more.
Sia is the deification of 'Perception', an important aspect in the Egyptian understanding of the world and kingship. The dagger Sia allows the destruction of the concept of 'perception' of certain things. A slash of it in the visual field of the opponent allows him to become undetectable in any way for them and even the world itself. Same for projectiles or any other attack.
Both daggers can basically reshape the material universe according to Ra's will and what he can 'see into existence'. The ultimate weapons of one who shaped the Earth.
It is needless to say, but the full potential can not be used anymore. The Servant container, even if heightened through the Ancient God designation is not enough. In the few moments he can fight, the daggers are used as his indestructible weapons of choice. They are still enough to momentarily manipulate perception of the opponent and create weak points. Entering combat in the container of Ancient God | Assassin grants him
Presence Concealment EX and
Man-Slayer and
God-Slayer A+.
As soon he has to start observing the world again, he switches back to Watcher Class before dematerializing. The use of the daggers and the Class Designation was too big for his container and destroyed his Saint Graph. But he will go with a smile, because his task as Watcher has been fulfilled and he continues to confirm existence from the Reverse Side of the World.