To get the most of the prodigy , you need :
In early game, find a Warrior escort, manage to save him and as a reward choose the Exotic Weapon mastery, that will be added into the Combat Training tree (if you don't have that tree, go buy it in some of the shops in Last Hope)
You can then put more points into it to max it ( 5 skills) .
Later when you go to the East, you will need to walk around water/sea place, so the Flooded Cave dungeon will suddenly spawn there.
Once it has spawned, go into it and after fighting the monsters in there find the stairs, it will lead you in a level in which the monsters aren't hostile and there's a water dragon named Ukllmswwik (i guess someone just fell on his keyboard when trying to invent that dragon's name

) to which you can talk.
Don't attack him, but simply say you're sorry to disturb him and you're going to leave, the water dragon will ask you to go kill Slasul if you're interested in saving the world, Slasul being the leader of all nagas (the ex Naloren folks) in the Temple of Creation.
Accept and jump into the portal the Dragon created, battle your way to the entrance against dangerous nagas, then battle your way into a long cavernous level against even more nagas.
And finally enter the Temple of Creation, and guess what .. battle your way again with dangerous nagas.
Until you reach the central room in which Slasul is waiting, go and talk to him.
With the dialogue you now need to side with Slasul, not fight against him.
Go back to the dragon and kill him for some loot.
The prodigy " Legacy of the Naloren " will become available to your character.
Before taking it, it's important that you have maxed Exotic Weapon mastery to 5 , because the prodigy will give you another 5 levels of skills into it, making the mastery much much better.
Then, go back to talk to Slasul after getting that prodigy, and he will give you the following trident :
http://te4.org/wiki/Legacy_of_the_Naloren