Artifact
Artifacts are the lightest Entity type. They have the least logic associated with them.
Creating an Artifact
Calling Battle.Artifact.new() will return a new Artifact object. Like every
other type of Entity, it will need to be spawned on the Field before it will
do anything.
When to Use
Artifacts should only be used for purely graphical effects. Tying any sort of logic to them beyond that is often a mistake, due to their update timing.
Other Entity types may only update during time freeze if they were spawned during that time freeze, and the next time time freezes they will not update during it. An Artifact, on the other hand, will continue to update during every time freeze.
This is perfect for a graphical effect, so it can continue to animate, finish its animation, and remove itself without blocking the players' view for very long. But if you have any logic that affects the battle tied to it, the timing can be thrown completely off by time freeze beginning during it.