Before we proceed to the failstack chart, I just want to share to you on how you can get your enhancing materials such as: Time-filled Black Stone, Tuvala Ore and Refined Magical Black Stone.

1st option: Go to fughar and do daily quest. To find fughar use the magnifying glass icon on the upper right side of your screen.

2nd option: Do weekly quests. Press "o" to open your quest window. Click "Recurring", it will show you quests that are repeatable. Scroll to the bottom and you'll find "[Seasonal] Even Stronger Tuvala Gear." NOTE: This set of quests gives the "BEST" amounts of enhancing materials via quest rewards.

3rd option: Killing some mobs. So far, this is the best method. Besides that it has a pretty good drop rate. You're also gaining some exps and skill points which will also make your seasonal character stronger.

FAQ: 

1. Is using Valk's Cry worth it? Yes it is, because you can now easily get one by exchanging 40pcs Time-filled black stone.

2. Is using Cron Stone worth it? This might be debatable, but considering that you can farm silvers from this server and your seasonal character can't buy gears on the Central Marketplace. You can just invest your silvers for Cron Stones to get a few safe attempts for PEN tuvala gear. (this is for full time seasonal server player only)

Below are the optimal failstack you can use from PRI to PEN of any ARMOR/WEAPON:

NOTE: REFINED MAGICAL BLACK STONE is best to be used on TRIs. 

 For upgrading from +7 to +15: You can use 10fs until it goes through. Why? Because it's pretty easy. ;)

NOTE: This chart may not be the "optimal" for everyone. Why? Because everyone has a different way on using failstack. Some people want it higher, some people want it lower. But FOR ME, this might be the most optimal fail stacks to use. 

I've stumbled into your guide while actually trying to enhance these Tuvalas!
What a coincidence, and it helped me alot ! I managed to TRI my accs and shoes for now till I get more mats to enhance. 

Thanks a bunch! \o/

Wah, thank you for the failstacking! I'm about to get myself a tuvala gear set and been wondering how much I need to while trying to enhance it. It's true, everyone got different lucks and RNGs.

Good luck enhancing and have fun in seasonal! uwu

@Qualene and @Rozenelle thanks for the appreciation. I'm happy to help. <3

failed PEN tuvala weapon 5 times with 70+ FS tho
RNG still RNG, unlucky me LOL
Hope it reach 100+ so I can do some PEN attempt

Sad to hear that. But, yeah pen is pretty much RNG than fs.

in PRI its okay if you don't use any failstack.

Yes, on accessory

May I see your TUVALA progression??? Since you post this one? Kindly don't be offended that I've known someone who only do a TRI yellow grade failstack to upgrade a PEN TUVALA accessory.