Miscellaneous Game Changes

NPCs

 * Travelling Merchant uses Gatligator in Hardmode, and Pulse Bow Post-Plantera.
 * Demolitionist uses Rocket Launcher in Hardmode.
 * Storm Divers attack almost twice as fast.

Items

 * Shroomite Bars require 12 Mushrooms.
 * Hellstone items require one less bar.

Armor

 * The Stardust Guardian does +10 Damage.
 * Vortex Armor's stealth doesn't slow the player down as much, but gives 5% less ranged damage.
 * Hardmode ore Magic Helmets have +2 Defense, and Ranged ones +1.
 * Palladium's Rapid Healing Buff regens slightly more.

Accesories

 * Cobalt Shield has a 50% chance to be Palladium Shield, with Orange and Orange-Red. (If the hardmode ores were chosen on world gen, then it would be whichever one would generate.)
 * Sniper Scope gives +12% Ranged Damage.