There are four chests you have to avoid when getting the Zodiac Spear (the easy way). First, is the chest right outside Old Dalan's place in Rabanstre Lowtown, the second is the (two) chests in the south east corner of the castle after coming up from Garamsythe Waterways (slightly before getting Balthier and Fran), the third are the three chests in Nalbina Dungeon, just after the pit-fight against the Bangaa Brothers. It is the room where you re-fit yourself with the equipment that was confiscated.
The fourth is among the sixteen chests on the beach at the eastern end of Vaddu Strand (in the Phon Coast region.)
You can also get the Zodiac Spear as a very, very, very rare drop off a chest in the Henne Mines Phase 2 Dig site.
The fourth is among the sixteen chests on the beach at the eastern end of Vaddu Strand (in the Phon Coast region.)
You can also get the Zodiac Spear as a very, very, very rare drop off a chest in the Henne Mines Phase 2 Dig site.