To go to south-east and to speak with black dragon.

To go to the bridge and walk on the letters of the dragon's name "PHILANDEMUS".

To found key at the north-east.

To found bleu door at north and to open it.

To go to the big trap (spears).

To return to north-east and to activate the lever.

To return to the trap's cavern (no trap).

To found rose's cavern.
To rotate cylinder.
To take crystal rose.

To return at south-est in dragon's cavern.
To give rose to the dragon. 

End of episode 21. 