About cc: paladin class merc does not sell pots, i had to fight some boss for it. They look like this for me:
If you can buy them directly - gg, choose one and cube with cc.
About RoC:
In act 5 you find rotting halls, grab wp and search map. It's a big map kinda divided in 4 segments, connected with bridges. Each segment has walled square area with zombie miniboss. Each miniboss drops 1/4 item. 3 of them are regular craft ingredient with nice description, 4th is a faking unique necro helmet. But you cube them all 4 in cube - get etheral charm with open portal oskill. Same as izual stuff. You enter that portal, kill boss, get his blank charm. Cube that blank charm with etheral portal skill charm - it will change colour.
From halls of rotting you find entrance down to halls of beast. Same thing, big map - cancer procs from mobs and wp, 3 minibosses. Also same stuff, cube 3 parts from bosses, get ethereal charm, enter portal, kill shit bla bla.
From halls of beast you find entrance down to halls of tortured. Same stuff, 3 bosses, one portal. This last portal leads to weird room with 3 offensive shrines. Kill all of them, get new portal and 2 ingredients. Cube them with etheral portal charm. Enter portal for realm of champions. Dark room, kinda like witch in median. 7 bosses, obviously one for each class. They drop class crystal, skill books and gold. Only hard if all 7 jump on you at entering portal. If you kite away and kill one by one - its ez than Baal.
Now you should have 1 cc + 1 class crystal from Roc + 3 small charms from those halls. Cube all - gg.
For more info:
http://www.aftermathcentral.com/SpecialAreas.htmhttp://www.aftermathcentral.com/SpiritualAptitude.htm