Nix gazed at his Klawn. Not bad, he thought, though he would never dream of showing it. They still had so far to go. And he resolved not to make the journey easy.
"If you want to survive what is to come, keep fighting, until you can no longer draw breath."
And with the slightest wave of his entombed hand, a plague came down from the sky, descending over the Klawn villages. Those who were to small or too frail, as well as those incapable of breeding, were struck down, leaving the rest untouched. Some of the lesser specimens would survive, if their will proved greater than their weakness.
Use one minor act to create a plague meant to affect only Klawn with below-average physical attributes, and the ones with the inability to breed.
This act left Nix feeling drained. His stone prison was becoming cumbersome. For all his power, he was still in so much pain. Ah well. That was the way existence worked. Sacrifice and suffering was required for true strength and power. Perhaps it was time to offer all these mortals the same opportunity.
Slowly, creaking and groaning the entire while, Nix outstretched his arm, and in the centre of the continent arose a tower. The tower held a door, and a warning: "Whosoever enters shall be given power and protection from all without, but suffer the greatest of torments within. Dare."
Any mortal was free to enter, and in doing so, would become Entombed, covered head to toe in a stone prison like Nix himself, and gain protection, strength and life unageing. The price one paid was to feel constantly trapped and suffocating, burning from the stone latched onto one's skin. One could never have children, so the cost of individual power was offset by never being able to leave a legacy beyond oneself. Only those with the greatest of wills could endure such torment, Nix thought.
Use one Major Act to create the Tower of Torment: Any mortal ( not just Klawn, although they'd have distinct advantages due to their physical advantages and the Mantle of Will ) can enter and be transformed into an Entombed, gaining supernatural strength and durability, with the downside being you'd really feel like you're covered in rock and cement, forever. No chance for building a family, or joining whatever society one comes from, the Tower simply offers power and eternal life, enough strength to crush one's enemies.