Neutral heroes can be used in melee maps via the Tavern, a neutral building to hire them.

The expansion and its subsequent patches made the addition of neutral Hero units.New item mechanics were added, such as the neutral Marketplace, which sells a rotating inventory of items, player-built shops, and inventory upgrades for non-hero units.Most aquatic mechanics were only available in the single-player campaign, but some creeps and the neutral Goblin Shipyard made island maps a viable template in melee matches (such maps became unpopular and were removed from the ladder selection).

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. The entirely new race 'Naga' has also been added, and can be played in several Sentinel and Alliance missions, as well as in custom maps.For each race, The Frozen Throne adds several new units, buildings and upgrades, and one new hero per race.

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