Any weapon that gets a substantial buff that sets it apart from other end-game weapons. Most sub-S rank weapons only get buffed to put them on par with the average starter S-rank, and the average S-rank only gains a small stat or affliction buff from extending. Some gain a substantial buff to make them on par with the strongest available, or makes them the strongest (Twin Kamui gains almost 100 atk from extension). Then there's the oddball low rank weapon that's fairly decent for a long time after extending (Miku's Leek Saber can get lv 5 stun...)
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