Players won't need to worry about Emerald Slimes multiplying, since they don't multiply upon death. Some of the larger slimes have a lot larger reach than the player, so if the player does not have much Effective ❤ Health and can get one-shot by them, they should probably fight them from afar with a bow. Also, these mobs deal knockback when they hit the player, so it is recommended that the player uses an anti-knockback item, for example a Slime Hat, Dwarf Turtle Shelmet, or a Rock Pet when killing Emerald Slimes.
Slimeball
Exp Share Core
Coins
Combat XP
Experience Orbs
Slime Hat, 
Dwarf Turtle Shelmet, or a 
Rock Pet when killing Emerald Slimes.
Added Slime.
Added Exp Share Core drop.
Slimy Runes.