When the Votans set out for Earth, they sought a planet they could remake into the image of their own homeworlds. Terraforming (the word borrowed from English) is the process of converting a section of a planet for Votan habitation. This includes everything from reshaping the landscape to introducing entirely new species of alien plant and animal life. However, when the Votans realized Earth was inhabited, they put their plans on hold. When the Arks mysteriously exploded, the terraforming equipment ran rampant, creating an unplanned hybrid landscape that is neither fully human nor alien. 
The terraformation devices follow a precise proctocol. The terraspire are dropped from the ark on orbit to their place of action. Than they position themselves at the top of their target by flying, and disperse 2 types terraspheres the one will flyes and quadrille the area with a radius of energie, this will modifie the geological structure and sterilise the area of native lifeform. The other will fall on the ground explode and liberate DNA who will restaure votan environment. The terraformation procees follow a precise grid.
Unfortunately when the ark falled the terraformationation system active himself but dysfunctionally and modified the topography and the environment but in the wrong way, combinating DNA of different species of artificially accelerated the evolution of other, created new species in a totally different ecosysteme.