The Frozen Throne reintroduced naval units into the game (they had been present in ' Warcraft II', but were absent in ' Reign of Chaos'), as well as amphibious creatures.Gold and lumber costs were recalculated, generally requiring more lumber for high-tech buildings and units consequentially, the population limit was been increased from 90 to 100 to accommodate additional lumber-gathering workers.The old siege engines of the humans, orcs and night elves have been renamed and remodeled, receiving new upgrades in the process (for example, Wyvern Riders were renamed Wind Riders, but the unit was otherwise unchanged).A smaller race, the Draenei, have also been included, though they can only be played in an Alliance mission and custom maps.
