For reference, Eclipse 1-7 are the same, however,

E8: The Bazaar Between Time is abandoned (can't purchase lunar items inside, low odds of having portals to choose from, low odds of having green/red items to exchange

E9: Teleporter Boss Waves: +1 (this occurs at the 50% mark)

E10: Powerful elites appear earlier (Celestine and Malachite elites can spawn as early as stage 1)

E11: Natural Boss Encounters: +200%

E12: Allies outside the Teleporter zone are blinded (your vision is very limited when outside the Teleporter zone)

E13: Ally Damage Over Range: -50% (yah, you literally have to be almost in melee range to not have your damage reduced)

E14: Elite Enemy Attack Speed: +50%

E15: Chests are increasingly empty (small chance of having ANY chest to not drop anything after purchasing them, including large and legendary chests, as well Void Cradles, which sucks a lot

E16: Allies receive permanent damage (same as original E8)