New upgrade for alchemy.
(it is far fetched but groundbreaking so bear with me)
The upgraded version of alchemy will be called ethereal (example: ethereal dragon ruby, maybe call it something else if you dont like it)
and it will be upgradeable to +9 and have all the available bonuses.
To not break the game only a few of the bonuses will further increase with the upgrade from +6 to +9 and scale less.
for example: +12 str at +6, +15 str at +9, 15% double yang at +6, 15% double yang at +9 (or 20% if it doesnt break the game)
To make the +9 upgrade possible new beans will be added working similar to how magic stones work. they will cost some beans + magic stones.
If you have all ethereal dragon stones active, the hp/mob/metin bonus will be double and if you have all +9 will be triple (than it is now).
Making those new dragon stones will be expensive and time consuming as they are end game.
First you have to be at least level 105 to make and use them.
Second, a new mechanic will be added named: alchemic mastery.
It works like the pet system pets.
You first use a book called alchemic knowledge(x) where x is the name of the dragon stone type (for example ruby)
and it costs 10 legenday dragon alchemy +0 of the same type (10 leg. dragon ruby+0 to buy a ruby book)
When you use this book you can start getting experience for each bonus corresponding to the type of book you used
example: you need to kill 1000 metins for the metin bonus, drop 1000 items for the double item bonus
but you need to have an alchemy with these bonuses activated.
once you have all the bonuses of the same type of book you used maxed you can upgrade a dragon stone of that type.
when you upgrade an alchemy you lose all that experience and start from begining to make another of the same type.
It is endgame so it is supposed to be hard to make but it really isnt that much harded than pets, just costs more yang.
Last, you can make them permanent by using time elixir(permanent) bought for a huge amount of cor draconis (maybe 5000) or something else.