Giants. Two to five times the height of most men, tied to powerful elemental energy.
There were, of course, those that lived in the clouds before the ascension. The Cloud Giants, who, in wake of catastrophe, opened their massive doors to their brethren. Giants of Fire and Stone, Hill and Ice live now in the castles in the sky.
The doors were only opened for giant kind. The rest are seen as invaders – the cloud castles need no God to stay afloat, and they fear the other species. Any ship that gets too close to a giant strong hold is crushed swiftly.
They’ve even stopped gathering slaves, paranoia over their eventual revolt overcoming sanity.
Giant ships are rare – they tend to leap from castle to castle, travelling miles in each jump. Only the lesser of their species cannot handle that kind of travel.