|Star Ancient Koosun|
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Star Ancient Koosun is a powerful elementalist boss that can rapidly take down the entire party, unless precautions are taken. If your team aggros him, it is wise to ignore all other targets and take Koosun out first.
- Widely considered the most powerful and most dangerous boss in the entire mission.
- In Hard Mode, Koosun can wipe an entire party with a single casting of Star Burst. Consider bringing one or two copies of Signet of Humility.
- The PvE skill Pain Inverter is incredibly effective against this boss, often bringing him down within a single cast's duration.