Pyramids of Vimerias

The pyramids of Vimerias are three large pyramids built from differing materials located in different regions of Vimerias. No one knows truly what they were used for, save perhaps Arkendor.
There are myths about their use, usually tales of alien communication. It is rumoured that all three must be activated in order to send a signal to other dimensions. Be careful who you tell this to, as some may be offended and think you to be insane.
It is also said that only someone with the secret code can activate their hidden doors and enter through winding tunnels leading deep inside the pyramids. Others say there is treasure inside and mounds of gold protected by tiny dangerous creatures.

Utility

It is believed they were used as a signal to other dimensions though something must have gone wrong since they’re no longer used.

Manufacturing

Probably magic.

Inventor(s)

Unknown.

Access & Availability

No one knows how to get inside them or if they are in fact solid, though it is believed there are secret doors which lead you through tunnels deep inside. Some say there are mounds of treasure hidden in the centre with small dangerous creatures keeping guard.

Complexity

They are very complex since they are such a mystery. The building technique would have been exceptional as no man now could ever think of erecting something so great and in that kind of shape. It is known the Tree-Folk enslaved man to build their great cities in Valgalia, so perhaps they once did this before leaving their homeland.

Discovery

No one knows who discovered the pyramids or who made them, they just seem to exist and are one of the biggest mysteries of Windoreld. They have been there since the beginning of time which implies the wizards know of them, choosing to keep their knowledge a secret.