u/Inner_Daymo

I'm a new storyteller but i've got an idea for my players I'm going to start. If they kill something / solve something / uncover something mythos related, they'll find a small stange object with markings on it (a D6). If they fine enough they'll also discover a vessel (I'm making - see video) but I want to put some extra markings on it, some other challenges they have to do or a order to have they have to drop the D6s into it to eventually summon cthulhu. Any help or ideas please?