I'd like to make shop where i give 20 Alchmist Chest Key(ID=9205) and in return get RANDOMLY one Interlude weapon(ID's=8678:8679;8680;8681;8682;8683;8684;8685;8686;8687;8688)
I think it would be best way to do that with adding some kind of new quest...but im not so good at writing that with random givings.
You can definitely achieve this with Jython. However, there is also another way with a multisell and a custom extractable item (it assumes that you can find an existing junk item supported by the client and then modify it server-side to make it extractable). For more details on this solution, see here: http://www.l2jdp.com/forum/viewtopic.php?t=9013
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