Use the Minor and Major Item Creation rules found in Arcana & Mysticism. Magic melee weapons always deal Mega Damage.
For Signature Items choose one option:
Base Item Sword of the Cheetah
TW Light Blade Str+d8+2 10 d4 2 −2 90,000
Notes: Costs 1 PP; blade has the sunlight Trapping. Looks like a sword hilt with a large
focusing crystal embedded in it until activated (a free action; otherwise a Light Improvised
Free Runner Edge
+2 to Speed