When you are trapped on the Isle de Oriens there is only one way to escape and that is to go to the door on the left and choose the passage on the right that goes to the boiler room. Select the ladder and enter the room and Vince will explain to you how you get out. Pick the first of the two options and Vince will ask you if you want a very rare water weapon. If you accept it the offer it will replace your Guardian Sword or Long Sword.

Make a Health Potion:
At Warlic's shop say 'explore shop' to him and find the Magma Leaf and place it in the big pot. Find Frogzard Tear and along with Mermazon Kelp put that in the pot as well and you will get a Health Potion.

Make Rare Spells:
By adding the following combinations together you can create the corresponding spells.

Fireball Z:
Elder Saggidus + Conflagration + Lavai + Fallarion + Cayla's Mirror

Whirl Tide:
Elder Saggidus + Conflagration + Lavai + FallowSea + Shadow Storm

Star Forge:
Elder Saggidus + Conflagration + Lavai + FallowSea + Kad Morag