Trina raises your upgrade success chance. BianKO's upgrade page currently lists a separate "with Trina" chance for every step, and with a Blessed Upgrade Scroll it takes every step up to +6 to 100%.

Which mob drops Trinas Piece

According to BianKO's mob pages, Atross has Trinas Piece in its drop list; the pages show no map or drop rate. No other record out of 1,621 mob pages drops it. There are two Atross records and the site doesn't say which one actually spawns.

Atross records (BianKO mob pages)
Record (id)LevelHPMain dropGroup drop
Atross (1402) 83 55,000 Trinas Piece, Gold Coin Blessed Enchant Scroll (STR, HP, Dex, INT, MAGIC), Blessed Immune Scroll, Blessed Reduce Scroll, Upgrade Scroll
Atross (6920) 83 1 Gold Coin Blessed Enchant Scrolls, Blessed Immune Scroll, Blessed Reduce Scroll, Blessed Upgrade Scroll (no Trina)

Trina from the store and premium

Store items and premiums that give Trina
ItemWhat you getPrice
Trinas Piece 1 Trinas Piece 60 AB
Accessory Trinas Piece Trina for jewelry 100 AB
Shadow Piece Doubles the Shozin craft rate (not a Trina) 60 AB
Switching Premium (30 days) 1 Trinas Piece + Ibexs/Crisis x1000, Wing Voucher, scroll bundles 700 AB
War Premium (30 days) 1 Trinas Piece + Ibexs/Crisis x1000, Wing Voucher, scroll bundles 600 AB
DC Premium (30 days) 1 Trinas Piece + Premium Potion HP/MP x5000, Wing Voucher, scroll bundles 600 AB

Clan Premium (500 AB) has no reward list, and neither the VIP Package nor the Farm Package includes a Trina. Trinas Piece sits in the store's Only AB tab, so there's no KC price for it.

Trina from exchange containers

Exchange containers with Trinas Piece (rate shown on the site)
ContainerRate shownWhere the container comes from
Random Item Exchange Gem 0.006% Pride (5801) main drop
Golden Star / Red Bow / Tinsel Ornament 0.003% Snowman (2702) main and group drop
Gold Exchange Box 0% The site doesn't list it

The percentages in these containers don't add up to 100%, so read them as relative odds. At these numbers, farming Atross or buying from the store beats hoping for a Trina out of a box.

How much Trina helps your upgrade

Success chance with Trina (BianKO upgrade page)
ScrollStepBaseWith Trina
Blessed Upgrade Scroll +4→+5 70% 100%
Blessed Upgrade Scroll +5→+6 50% 100%
Blessed Upgrade Scroll +6→+7 15% 30%
Blessed Upgrade Scroll +7→+8 2% 4%
Upgrade Scroll (up to +5) +3→+4 40% 80%
Upgrade Scroll (up to +5) +4→+5 20% 40%
Accessory Compound Scroll +0→+1 55% 82.5%
Reverse Scroll +2→+3 25% 50%
  • Trina pays off most at +4→+5 and +5→+6, where a Blessed Upgrade Scroll goes from 70% and 50% to a flat 100%.
  • At +7 and +8 it only doubles the chance (15%→30%, 2%→4%), so the item can still break.
  • The page notes that +8 High Class upgrades were closed for the first 2 weeks. Items cap at +8, jewelry at +3.
BianKO promo boxes for upgrades (+8 cap), coins (valuable GB) and skills (Spell Stone Powder)
The OASIS promo lists a +8 upgrade cap · Image: BianKO
Source / rights
Image / usage information: (c) BianKO / ARTY. BianKO'nun kendi sitesinde ve forumunda yayımlanan tanıtım görseli (22 Eyl 2026 indirildi); kaynak sayfa bağlantısıyla gösterilir, sahiplik iddia edilmez. · Image source ↗

FAQ

Do bosses drop Trina on BianKO?
No boss has Trinas Piece in its list. Yellow Sand, Pidama, Worm, Felankor and Isiloon drop Gold Bar, Silver Bar and KC vouchers instead.
Is Shadow Piece the same as Trina?
No. Shadow Piece doubles Shozin craft rates: Ruler weapon 3% to 6%, Dragon Armor 10% to 20%, Draki Pendant 50% to 100%. It doesn't appear on the upgrade table.
Which Trina do I use for jewelry?
The store sells a separate Accessory Trinas Piece. On the upgrade page, Accessory Compound Scroll with Trina is 75% for both +1→+2 and +2→+3.
What's the Trinas Piece drop rate?
The site doesn't list it. Atross's page only shows Trinas Piece in the main drop list, with no percentage.

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