I'm almost finish and before last battle I decide to came back the watcher keep yhat I start in soa and I have only 2 scepter gem and I'm stuck in the maze because I need the scepter of radiance can I have a cheat or clue because I can't go back in SoA and I cannot go to the next level please help me Thks

Follow the guide here.

I done everything on that level but I need another scepter gem and I'm in front of the portal ready to go to the other level
but I cannot go back because I almost finish ToB and I decide to come back in the Watcher Keep before to finish the keep before going back to TOB and finish the game . Ouf.. trying my best to explain Thks

I don't understand. If you've done everything in this level then you should have the 3 gems. One you get from the tanar'ri (Tahazzar), one from the demon (Ka'rashur), and one in the final room from the Cambion (Aesgareth). If you don't have all three, what did you miss, or what went wrong?

During the time I was playing SoA I start the Watcher keep and it was hard so I had only the gem of Aesgareth and I decide to stop trying to finish the Watcher Keep and continue my journey through SoA and I think I sold my gem in a store but don't witch one thinking that it was like all other jewel. So I finish SoA and I said to myself I'll come back to the keep when I'll be stronger so after I had almost finish ToB I said to myself before finishing to game I'll go back to the Keep finish it and after that finish ToB

You cannot sell them. They are plot items, have no value and are flagged as unsellable.

If you are desperate to get them, you can add them through the console. Type in the following:

CLUAConsole:CreateItem("PLOT02C")
CLUAConsole:CreateItem("PLOT02D")
CLUAConsole:CreateItem("PLOT02E")

Sorry it took so long io respond my wife broke her ankle and I have to do what she was doing + my job meanwhile I cheat to have the scepter fully assembled and now my wife start to walk so I came back playing and I'm trying to get rid with Melissan but at the third fight when she have the Blade barrier I'm trying many times without succeed when she have the blade barrier she's really tough

Spells to learn/memorize:
High level summons (Planetars, Devas, Elemental princes)
Breach
Pierce Shield
Ruby Ray
Warding Whip

Items on hand:
Wand of Spellstrike
Staff of Magi
Flail of Ages +5
Ring of Free Action
Any weapon that grants Negative Plane Protection

Thks for the post but now I got her it was a really long journey strating back in candlekeep but it's worth to be patient and do all the game to the end it's a great game really