Power score is one estimated rating of your current build, produced from the stats and gear you have entered. It is this site's own estimate — not Nexon's Combat Power, and not a promise to match any other tool's number. The Dashboard's top card calls it Hexa score, and your roster cards call it Power.
The score reflects the build's current assumptions: your stat block, your HEXA or Erda Link nodes, and your rings. Change any of those and the score moves. A marker beside it, Add HEXA levels (or Add Erda levels), tells you it is counting only the board 6th Job granted until you enter yours. The breakdown — collapsed under Where your power score comes from on the Stat calculator — is the same build's numbers viewed piece by piece, so use the pieces to see why the score moved rather than as independent ratings.

