I am trying to figure out when it is time to use my Kizune on Artifacts Explorations as i am prioritizing getting all the upgrades over lvl 25+. And i have afew questions:

1. Does Port's Exploration return only artifacts ?
2. Are these all the artifacts quality possible: Inferior, Normal, Fine, Superb ?
3. How do people get so much Kizune, i am seeing the same names alot in the Loot tab.