Colosseum Tournament

[Proto Man]

I use artefact when I'm refering to 'artefacts,' the Omniverse objects.

Otherwise I use artifact: 'An artifact from the days of Darkshire's glory.

And for the record, the correct term for the facility we're fighting in is Colosseum (proper noun). Since it's based on its Roman equivalent (which is called the Colosseum), I used that spelling rather than coliseum.