What if, in order to get the xp back, you have a food selected when you click the jar, and the food becomes (name of selected food) level 1 (or 2,3,4,5, etc.). The food level is the same as the number of levels (from 0) you recieve when you eat it. The way it is calculated is it gives you the amount of exp to go from 0 to 1 if it is level 1 food, the exp to get from 0 to 2 as level two etc.
The amount obtained from the jar is rounded down from whatever the amount of exp in it is to the nearest level . The jar will tell you beforehand how many exp are needed to get it to the next level so you do not have to waste exp, or the jar will retain the exp that is not part of a full level. Also, the only way to get the exp up without advancing a whole level is to eat (for example (the numbers can be different)) a level 5 food when you have level 50, and it will just give you the amount of exp needed to get from 0 to 5.
p.s. Also maybe if you feed food with levels to a cat or dog the max number of hearts they have increases or something. This would make it so that if you only want one animal with you at a time but need lots of help, you could just give it a low level food.
You have to stay alive to get back to your jar; a requirement toward it would be that it'd already be placed on a surface. The incentive to stay alive is still there; it's just less pressing for those who see the game from a more creative standpoint.
Besides, if you don't like the ease of it, don't use it. :3
Creative-in-Survival has to take risks like everyone else regardless of the origin mode they are familiar with. I don't think they need special treatment on their standpoint.
Otherwise, yeah, a XP bottle would be semi-nice, if only because it would make nice decor.
The lack of such an item is the reason why I got the Experience Book mod. My secondary reason is it gives a use to gold (and another one for books), so whatever the recipe for this item would be, I hope it involves gold. Maybe, gold should be used for magical stuff. (XP books, Golden Apples, Golden Swords kill Werewolves) Sure, the other two are mods or in them, but that seems to be the general consensus in Minecraft and it's mods.
After reading more of the OP, I realize now this is for more than just half your current XP level. Actually, it seems to have a max, something I like about it. If it say.. maxes out at level 25 or 50, that seems like something worth adding. Not to mention, you can set one up to share with other players, so friends don't get left behind. It actually seems better than XP books, even though they don't really have a limit. The catch to them is they only store half of what you currently got built up.
Actually, I think XP books should be made vanilla anyways. XP Books could still be the stepping stone. (because two gold bars and a book would be a lot cheaper than a trip to the Nether for one or more of the materials) Not to mention, if the mod creator allowed it to be used in the game and this way, it could possibly be a part of the Experience Jar's recipe. (The magic of a XP Book.)
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"I don't plan to add a new dimension at the moment. It's just to performance heavy on servers, and the current dimensions need more attention before we start adding new ones." < Yeah, like biomes or actual varied terrain in the nether. Nether ruins didn't do the trick at all.