FoW stands for Fissure of Woe, a place that can be entered from the Temple of
Ages. The Fissure of Woe is for players that wish to seek easy experience
needed to get skill points, or to have fun in. Regardless, Fissure of Woe
requires that you have a good team before you enter. You can only enter the
Fissure of Woe provided that you are ascended. Nearly all groups will not take
you unless you are Level 20 and have some Elite Skills, because all monsters
in there are Level 24+ and do good amounts of damage.

To enter the Fissure of Woe, your country needs to have Favor. If you do, go
to the Temple of Ages and look for the Champion of Balthazar. Talk to him,
pay him 1,000g, and you will be warped to the Fissure of Woe.

Since there are two areas that can be entered from the Temple of Ages, each
area has its own items that can only be found in that specific place, but it
is a very, very rare occurence that a Underworld drop may actually drop from
a chest in the Fissure of Woe. The Fissure of Woe has these area-only drops:

Obsidian Shards
Chaos Axe
Shadow Shield
Shadow Staff
Shadow Sword (Was removed from earlier Beta testings)
Shadow Bow
Dark Remains

The Fissure of Woe is the only place where you can craft the Fissure armor.
For people looking for Fissure armor, they will go here to craft it.

EXAMPLE: Forming group to go craft Fissure armor in the Fissure of Woe!