The protection of a True God? Mortal battles didn't need it thanks to the fundamental laws of the world; it was impossible for True Gods to directly intervene in mundane matters.
That Forest Guardian God of the Elves? He had used his life to demonstrate what would happen if one broke the rules.
But it was enough for the brave warriors who fought to protect their own people.
The mortal King of Mist announced their glory while Wumianzhe from the heavens above announced that their heroic deeds would be recognized by everyone. Even if they died and their souls slept forever in the River Styx, it would be fine—it was fine as long as their glory existed in the hearts of the true warriors of the north.
For the beastmen, however, it was devastating. Perhaps a True God's protection seemed rather ephemeral, but it was actually supremely dangerous when they witnessed it for themselves.