The phrase "powerful artifact" refers to an object or item that has special abilities or great strength. It could be something like a magical weapon, a device with unique powers, or an important relic with significant influence. Full definition
Race against the deadliest bounty hunters in the galaxy to collect ancient and powerful artefacts before they can (nintendo.co.uk)
The mysterious «Deathly Hallows», three powerful artefacts allowing the user to conquer death, must be uncovered and claimed. (empireonline.com)
Mystic Bounty involves collecting powerful artefacts scattered throughout the arena to earn more points than your opponents with different colours representing varying points values such as 5 points for collecting a green artefact, 15 points for a blue artefact or 30 points for a purple artefact. (thezombiechimp.com)