This setting takes place in a time equivalent to the ancient world. My kingdom needs an unlimited energy source that doesn't run out and cheap to manufacture. To do this, I have captured a Golden Wyrmm, a massive creature with magical properties that can be used for powerful rituals. I have enslaved it to my service, binding it underground to a temple which I have build my entire society around. It has been defanged, with its teeth used to create special daggers that are magically linked to its source. Its magic power was then used to bind the souls of living creatures who die in a large radius of the creature. On "Holy Days", a number of innocent people are selected for the sole purpose of serving as human sacrifices in order to sustain the creature and the soul binding magic built into the structure of its temple The instruments of sacrifice will be those daggers that were fashioned from its teeth.

My armies then go forth into the world, conquering kingdoms and taking their lands. They take control of their civil societies, enslave their population, and use them to build a temple in each settlement that will be magically linked to the First Temple. Everywhere a temple is built, some locals are sacrificed in a ritual that takes place simultaneously in the new settlement and in the First Temple. This day marks a new, local, Holy Day, and the ritual must be repeated annually for that temple to retain its power and link to the First Temple. The souls of the living creatures that die within that temple's area (an equal radius as the First Temple) will be bound, and transferred to the First Temple.

I now have what is effectively a nuclear plant, started by a magical beast that simultaneously serves as a fuel storage unit and reactor, storing and burning all of the living souls that die within the vicinity of the pyramid system. The problem is that even though these temples are linked, they still have to be connected through some means, and are limited by certain factors: 

1. Magic in this setting is limited to the user's vicinity and cannot extend over great distances, as its effect would weaken the further it gets.
2. The continent is similar in size to Eurasia, with many different biomes (jungles, deserts, savannas, etc). Much of this is difficult terrain to cross.
3. Breeding Wyrmms aren't a viable option, since they aren't born naturally and take centuries to reproduce.
4. I must also take into account rebel armies and their attempts of sabotage.

With these stipulations, how can I link these pyramids together while taking all this into account?