Which race would you add to Heroes?

Do you remember the 3 Heroes? Instead of the elemental city, Conflux, they wanted to make a mechanical city, Forge? I think it would have been quite appealing - steam engines, gears, gnomes-mechanics, orcs with chainsaws...
And also, something snowy and icy is needed....Or an underwater faction? Leviathans, mermaids, krakens, herring-man-eaters as a super monster...