so, i had a question about this item, should i buy it from the mage, or should i just look for it inside a chest? im currently level 14 with 15k tp I just finished that one quest where you must kidnapp the baby orkind

I now use Fire staff with Water book. You can read and contribute your build on Wiki page. Here is what I wish to share.

1. You don't need quest specific staff for the Goblin baby quest. What you need is sneak and throw. You'll go to the spot. Save BEFORE you watch the cut scene. There is a chance the goblin will stand and look at some very unfortunate direction which make grabbing the thing really difficult. When it's time, just throw stuff and sneak in to grab the baby, then bolt.
2. My go-to, as mentioned, is Fire staff + Water book.
3. Water book is good for distant management. Fire is big damage. This allows one-shot which is good for sneak mission. Electric staff is more reliable if you can manage distant well.
4. To use Waterbook for distant management, simply use water tornado in front of you. 2 tiles for close combatant, 3 for polearm. Some may land a hit on you, but in that case, add 1 more tornado tile. Then blast them with Fire or whatever you wish.