AeternoBlade is a hack-and-slash action game with RPG elements that puts players in control of Freyja. The game incorporates time-manipulation mechanics, including time travel, time warp, and time reverse, to solve puzzles and overcome enemies. Freyja's abilities can be enhanced through stat upgrades and the equipping of relics. The narrative follows Freyja's quest for revenge against Beladim, the Lord of the Mist, for the destruction of her village.
Corecell Technology Co.,Ltd developed and published AeternoBlade, a title that blends fast-paced combat with exploration and character progression. Players gather yellow orbs to upgrade Freyja's health, mana, attack power, and mind, which influences the ultimate gauge fill speed. The game's move set is also upgradeable, with each basic attack capable of being enhanced twice to unlock more potent combos and damage. Relics, found in hidden locations or dropped by enemies, can be installed into Freyja's AeternoBlade to further augment her capabilities, with upgrade relics available to improve their effectiveness.