what is supposed to be 'expert' about expert mode
so far the only thing that's done something new is the eye of cthulhu, everything else has just done more damage
everything else has just done more damage
also:
zombies can spawn with weapons
skeletons can throw bones
spiked slimes will shoot a massive amount of spikes if you get too close to them
water in cold biomes gives you the chilled debuff
life regen is slower
there are special accessories
i think debuffs may last longer too