I'm gonna need a New Blade as a Quest and I'm Gonna Need 3 Mitril Ore, I find one in the South Dungeon but I need Mitril Pickaxe to Mine It.

How to I get the Pickaxe?

Edit:   Got It!

First Obtain the Quest "Fragments (3)" and Armor Breaking"

Then Find An Elf Located at a Blue Villa 

(It Doesn't have a Name Written in the Map)

Just Go Below Threntem at No.6

(Search at Google the Map No.)

Then You can Encounter the Chief Elf at the Blacksmith's Shop at Aldlyn then Go Below the Vegetable's Shop ( still Inside Aldlyn ) and You can meet the Chief Elf again and shows you Ebron (The Hidden Village) and There You can Meet Knocky and Gives You Mitril Pickaxe.

So how do I get back to the Forest?? 

Edit:   Found It! 

After Entering Threntem Go to The Right 

(Near at the Writer's House) then You can see the Forest 

But to Reach the Secret Path, You must go into the (Right ->) Direction at Below the Forest

There You'll See a Small Road then Press and There You can Find It.

Just keep going Right ->