There is this interesting Minecraft SMP called the Soulbound SMP. The server is centered around getting custom hearts through advancements (each heart can only be unlocked once). This is a list of the videos made on the server and most showcase the plugin. Please let me know if you can make the plugin! https://www.youtube.com/playlist?list=PLDXMVQA6SkDJcmitQBid_M2XF0q1qS6GQ I forgot to say this, but this is a 1.20.1 concept. EDIT by Moderator: merged posts, please use the edit button instead of double posting.
@SetoPlayzYT Explain the plugin yourself, don't point to another servers video's to explain it for you. Nobody is gonna watch 2 hours worth of video's to badly explain what you really want.
@SetoPlayzYT I think I understand the concept of what you are asking for, but like timtower said I will not be watching an entire YouTube series just to figure out what features you want in the plugin. If you give a full list of features and explanations around the "custom hearts" I can see if it can be implemeneted. Simply having an Event Listener which triggers when you get an advancement and giving a custom item isn't complicated, but like I said from what I can tell there is a large list of custom features here and you would have to give me that list because I won't be piecing it together myself