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The Heat Saber is a large, humanoid Heartless covered from head to toe in silver and grey armor, although in Kingdom Hearts χ this armor is maroon. The armor on its legs sport white spikes and steel blue highlights. Its helmet sports two short, white spikes and a long, twisted, black antenna. A small opening in the front just barely exposes the Heat Saber's black face and glowing yellow eyes. Its most notable features are the jagged, seemingly molten blades in place of each of its hands. It has two Heartless emblems, one on each of its shoulder pauldrons.
The Heat Saber's name refers to its fire-based attacks and the blades on its arms—the word "saber" or "sabre" refers to a lightweight sword now used in fencing.
The Heat Saber is not an easy opponent to defeat; luckily, Xion and Axel join in the battle. It uses the element of Fire in its slash attacks, so equipping the Fire Charm or even the Tears of Flame is recommended. After the Heat Saber unleashes a combo, it will stay still for a small period of time; at this time, attack with Blizzard magic as it is weak to it. Continue in the pattern of dodging the Heat Saber's combo and using Blizzard magic when it pauses. Also, attacking this Heartless while it is storing energy will cause it to immediately perform its focused slash.