Star key

[Lax]

Ok, up until now I've played the game (all 6 episodes) like 4-5 times, each time doing more and more quests (or whatever you call them), gattering items and so on, but now I have a prob. In episode 6, in Estrana (after much solving and what not) I find the door to Lexus (it's in the tomb with the flowers, below where her original grave was, I know all this cuz I've solved it before but forgot) and I don't know where the star key was! So, any ideas??

[Ovenhole]

In the room with this underwater puzzle right above Jopaga's lair, where you got the crescent key. Through the left door, there's a chest you probably opened already, and behind it a pool of water. When the water is on in this room, just swim there and press enter to dive.