One prototype was a tower made of Darwen, coated inside and out with Davross.
The former would grant the tower nigh-immunity to magic while the latter would provide the artifact with magical conductivity and protection from physical blows since Darwen was brittle by nature.
The second prototype was made of a single white crystal and was shaped like a Raiju, reminding Vastor of the Horseman's steeds.
"Let me guess. This one is the standard tower that can't move from a mana geyser, like Menadion's." Vastor pointed at the Darwen miniature.
"Correction. It can't function without a geyser but it can move." Bytra said. "Menadion had crafted devices similar to Home Stones that she used to mark mana geysers and Warp the tower from one to another.
"After the first visit, the tower recorded the coordinates of the geyser and the Home Stone was no longer necessary, leaving no trace of her passage."