The Underdog Duelist

an Underdog File follows very specific File-building rules and is made mostly of Underdog Cards. Please take a look at the requirements below to make sure your Underdog File follows the rules.

Soul Cards: Your File must have at least 4 Underdog Soul cards. The 1 remaining card can be anything.
Play Cards: Your File can only have 2 cards that are not Underdog Cards. Also, see the exception list below.
Exception List: In addition to your 2 cards that can be anything, you may add up to two cards from the following list to your file, even if they are not on the Underdog Lists:

Will o the Wisp, Shade, Salamander, Dryad, Sylph, Undine, Kasaran Pasaran, Archer Scout, Owl Sage, Recovery Powder, Soul Pact, Rapid Growth, and Meaning of Failure.

Whenever you gain a win with an Underdog File in the Folrart Arena, you'll see a record appear on your Profile under the My Iczer Tab. Once you gain 10 wins, you'll earn the achievement again!

Here are the Underdog Card Lists.

Underdog Play Cards:
alteil.apocoplay.com/index.php/strategy/underdog-play-cards
Underdog Soul Cards:
alteil.apocoplay.com/index.php/strategy/underdog-soul-cards

You can also find them on the main site under GAME INFO -> STRATEGY. The lists update every two weeks, so you should double check each week to see if your File still qualifies.

PRE-REQUISITE: Have Welcome to Alteil Achievements (1-11)
REQUIREMENT: Accumulate ten wins using Underdog Files in Folrart, battles must go at least ten turns.
COOLDOWN PERIOD: Two weeks.
REWARD: 10 Point Cards