setblock 6 235 -184 lime_stained_glass

summon item 6 236 -184 {Motion:[0.0,0.5,0.0],PickupDelay:32767,Tags:["no","boss_key"],CustomName:'{"bold":true,"color":"green","text":"Boss Key"}',Item:{id:"minecraft:coal",count:1,components:{"minecraft:item_model":"minecraft:keys/slime_queen_key"}}}

playsound entity.slime.hurt master @a ~ ~ ~ 10 1 1
playsound entity.illusioner.prepare_mirror master @a ~ ~ ~ 10 0.7 1
playsound entity.illusioner.prepare_mirror master @a ~ ~ ~ 10 0.7 1
playsound entity.illusioner.prepare_mirror master @a ~ ~ ~ 10 0.7 1