Known artifacts are the Arkenhammer, the Arkenpliers, and the Arkendish collectively referred to as the Arkentools. Parson's first Stupid Meal mentions there are four known Arkentools, but we don't know what the fourth one is.
Artifacts are powerful magical items supposedly created by the Titans themselves. Each is unique, priceless and possessed of vast powers that can be used by anyone fortunate enough to both acquire one and become attuned to it. Wars have been fought over less - and the power of artifacts can raise and lower rulers and kingdoms.
Prominent artifact-based factions include Charlescomm -- powered by the might of the Arkendish -- the regime of Stanley the Tool, who came to power through his possession of the Arkenhammer and regards it as a mark of his consecration by the Titans--and most recently Wanda with her acquisition of the Arkenpliers which she believes were destined for her by the power of Fate. While still claiming loyalty to Stanley the Tool, she does have her own units and symbol to form a side within a side.