only cauldron, yes. and it could make ingredient which player don't have.
ex) 4 5 6
1 2 3
when you have only 1 and 2, by selecting 1 or 2 first you can make potion which require ingredient (4 or 5) and (1 or 2).
this means while you have only 1(1+2) combination choice, you can make 5(4+1, 4+2, 5+1, 5+2, 1+2) combination.
and about discord link- it was my browser error. link is okay sorry for that.