Game:

Xenosaga Episode I (2002)

Duration: 6:07

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3

Sub-Boss #1: Mercurio - This is first sub-boss, and optional boss, you can fight. If you don't beat it here, you can come back later and curbstomp it with a better party. But Ziggurat 8 can handle it with MOMO's support. She can heal him while he does all the heavy lifting with physical attacks. Ether attacks do little damage. Just don't attack it when it's shield is up, you'll deal reduced damage and it'll counter. Use the time to build AP. MOMO can also put it to sleep to give you more turns to heal up. Sleep will wear off when an enemy is attacked, so you can't just get an easy win that way.

For beating it, you'll get a Decoder which can be used to open a door in this very area, which leads to the Thief Ring, which gives you a +10% chance to get rare drops. So the major benefit of beating this guy early is for the chance of getting better drops sooner. But this isn't super important since the time you can come back here to fight it isn't much father away anyways.