I mean it is the last boss. 2 sentry weapons seems like a waste.
I would trade the Lunar Portal Staff for a staff that summons True Eye of Cthulhus (that teleport and go through blocks) which shoot bolts (that pierce enemies, never miss, and go through blocks) - kind of like the actual True Eye of Cthulhus you fight during the boss battle; except for the "never missing" part which I felt if left out would make it a downgrade from the Stardust Cell Staff.
I would trade the Lunar Portal Staff for a staff that summons True Eye of Cthulhus (that teleport and go through blocks) which shoot bolts (that pierce enemies, never miss, and go through blocks) - kind of like the actual True Eye of Cthulhus you fight during the boss battle; except for the "never missing" part which I felt if left out would make it a downgrade from the Stardust Cell Staff.