All Eternals are fueled with cosmic energy, giving them access to a vast number of abilities. So like all other members of her race, Thena's powers include flight through levitation, shooting beams of energy from her eyes and hands, manipulating matter, telepathy, and teleportation. She also possesses superhuman strength, speed, and agility. And as an immortal, Thena is nigh-invincible and nearly impossible to kill. Eternals are able to use their cosmic energy to train their abilities, which is why some Eternals are more powerful than others. Thena has honed many of her powers over thousands of years, thus making her one of the most formidable members of her race.

Thena doesn’t just rely on her natural-born powers to win her battles, though; she is also highly skilled in weaponry. Since the Eternals possess advanced technology, Thena occasionally carries a special crossbow that fires bolts of cold energy into combat. Her signature weapon, however, is actually a spear. Thena is rarely seen without her golden spear, which can emit heat energy and deploy an anti-gravity field when thrown. In the Eternals trailers, Thena is shown forming her spear and shield to fight and train, while she's seen wielding a sword in another scene, one she likely created through energy manipulation.

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