Own
Moderator
Having obtained my fairy pet, I can now share my build.
Skill Build Order:
Silver Flamethrower. All further gold points into Flamethrower.
Silver Frosty Friend.
Silver Protect.
Talent Build Order:
+Critical chance.
Manaburn.
Intelligence.
+Critical damage.
Equipment Reccomendations:
The Green Robe is surprisingly better than the robe that gives MATK or EP Regen, given that it drastically reduces the charge time of the skill at the expense of damage. It's worth it, the less time you remain stationary, the better.
Blindfold or Spectacles are equally viable. +5 Crit is probably on par with +15 MATK. If you get neither Blindfold or Spectacles by Floor 4, you may want to restart. Especially do it if you get no Magic Ring.
Tactics:
The first few levels may be difficult, you're a stationary flamethrower. Shield cancelling your flamethrower may be necessary to get yourself out of some sticky situations.
When you load into rooms at Silver charge, hold down the Flamethrower to immediately charge it so you can sweep the room behind your Frosty Friend. Your Frosty Friend will draw aggro and soak damage for you.
The Frosty Friend has many uses. He will rush ahead to draw all enemy attacks, he takes damage so you don't have to and he helpfully eats up most of your EP so that Manaburn can trigger more easily. Always use him at his highest charge level to ensure he eats as much EP as possible. Don't forget to trigger his Rage Mode with Skill Button + right.
The overall theme of this build is to burst down bosses before they get too many chances to harm you. The longer a boss battle goes on, the more chances you will get hit by random junk. Winter is the worst example of this.
Feel free to pause the game during Gundam's barrage or whenever Winter feels like being a prat hiding in his blizzards, spewing spikes or fists everywhere, switch to a full DEF build. You're going to take a hit, might as well make sure it's not one that will instantly ruin your run. To this end, don't sell your +DEF accessories or highest +DEF gear past Floor 10 or so.
Good luck.