The Loom of Fate is the font of the Sidereals' power. So the Wyld is the source of the Lunars' power. Due to it's infinite potential and the Lunars' ability to use it, their power is potentially limitless, restrained only by their Essence. This is how they manage to battle against mighty Fair Folk in a place beyond Creation and Fate, beyond reality itself. The Solars may be able to push back the borders of the Wyld but it is always there, it is limitless and so are the Fair Folk. Only those whose power is equally limitless, whose power is drawn from it can hope to successfully fight against it. To this end she made her Chosen, to fight against the Wyld in many ways, each one was an aspect of her nature. The weakness of the Lunar host caused by the Wyld Hunt precipitated the creation of the Silver Faction who were determined never to risk Creation being swallowed up by the Wyld ever again. Lunars are still vulnerable to the forces the Sidereals can put against them. Although they can escape Fate by entering the Wyld, it is their natural battle ground, they need human contact as much as anyone and part of their duty is to lead people to fight against the Wyld with them. Hence Arvida's expedition that created the Haslanti League by leading ice walkers to rediscover the lost wonders of Tzatli.