I'm on the latest version of the PS4 and try to farm the Blessed Apple. However, the apple only has a drop rate of 0.5% or less (1/200).
Now I have killed 400 enemies from the spell area and still do not get it. I need to beat a certain boss for this item because I have not killed any bosses in the hardmode yet.
No, you do not have to beat a boss for it. The apple can be dropped by Hallow enemies as soon as the Hardmode is activated.
Are you sure you are in the right biome?
Quote from Wiki: "The blessed apple can be dropped by all https://terraria-de.gamepedia.com/Hallow opponents, with a 0.5% / 0.67% (1/200 / 1/150) chance."
Yes, I even expanded the sacred biome.
Then you just have to continue patiently… This can sometimes take a long time.
The drop chance is "only" 0.5%. This is actually relatively bearable, considering that all opponents from the Hallow can drop the item. Important: The opponents from the Underground Hallow can't drop the item. Accordingly, the opponents you should most often encounter are the Pixies and Unicorns (fairies and unicorns).
You could, for example, Place watercandles (the blue dungeon candles) to increase the spawn rate of enemies. This will give you faster kills and consequently more chances to get the item.
