A new building, where you can create new buff, but not like in provision houses, get two existing buff and mix up a new buff.

Basics:
Mix
Buff A level 1 +
Buff A level 1 = Buff A level 2 (It lasts twice as long)
level 1 time = n
level 2 time = 2 * n
level 3 time = 2 * 2 * n
level 4 time = 2 * 2 * 2 * n

for example:
You have 2 fish platter (lvl1) (30 min), you mix up and you get a new fish platter lvl2 (1 hour)
You have 2 fish platter lvl2 (1 hour), you mix up, and you get a new fish platter lvl3 (2 hour)

Limitations:
- Rainbow, etc. buffs can't? be mixable.
- Every buff has a max level for example (Exotic Fruit Basket lvl2, Employee Of The Month lvl3)

Unlock building:
When you reach level 26 you will get a quest chain. If you finish you will unlock the building.
Tasks about cooperation and multiplayer gaming
- Have x friend
- Use buffs n times on friends island
- Create 2 and 3 players adventures
- And the big one: finish The Siege and The Buccaneer Roundup coperative 5 times (and it will be important read below)

Unlock buffs mixing up:
From lvl26 After each level up, you unlock a new buff mixing up, from lvl 26 to lvl 70.

New material need for mixing up:
- Every mixing up need 1 new material.

- If you play with other and finish a cooperative adventure. You earn that new material.
The Siege (lvl 26, 2 players): 20 materials / player,
The Buccaneer Roundup (lvl 26, 3 players): 40 materials / player,
Lakeside Treasure (lvl 36, 2 players): 40 materials / player,
Raiding The Raiders (lvl 36, 3 players): 80 materials / player,
Tomb Raiders (lvl42, 4 players): 80 materials / player,
The Whirlwind (lvl46, 4 players): 120 materials / player.

- This new material is tradeble.
- The new mixed up buffs tradeble.

Summary:
- New buff mixing up building
- Unlock the building with quest chain (cooperative, multiplayer)
- Unlock buffs mixing up with earn level up (up to lvl70)
- Need a new material for mixing up
- You earn the new material as reward finishing the cooperative adventures.
- This new material is tradeable.
- The new mixed up buffs tradeble.

This modification ...
- provides a bit more varied gameplay
- it will be a little bit more valuable the team game and the cooperative adventures
- Some good but not so important buffs (like Mr. Myers, Miracle Bait, Magic Bean Soup, etc.) would be more usable, and of course would be interested Aunt Irma’s Feast lvl2, Aunt Irma’s Gift Basket lvl3, Grilled Steak lvl2 etc
- The tradeable property gives a plus for crafter style players.