Is there matk up by agi armor?

No, unfortunately it looks like no armor increases matk by AGI, even a little bit.

◇Burnos [Crystas]
MATK up based on AGI
[X = AGI] [X = X / 4] [X = X + 1] [MATK up by X]
Notes: Note: AGI × 1/4 rises as MATK

If really want matk up by agi on armor can use burnos. If on spec hicolon

◇Hicolon [Crystas]
Spell burst -3% MATK up by AGI on Special
Spellburst -3% [Special] [MATK up by AGI]

If from add

Blue Glasses [Additional] 📷
DEF: 6
Melee+2% to Fire ATK up by 10% of CRT MATK up by 50% of AGI
Melee to Fire +2% [X = 0.10 * CRT] [ATK up by X] [X = 0.50 * AGI] [MATK up by X]

Red Glasses [Additional] 📷
DEF: 6
MATK up by 40% of AGI ATK up by 20% of CRT Melee+2% to Earth
Melee to Earth +2% [X = 0.20 * CRT] [ATK up by X] [X = 0.40 * AGI] [MATK up by X]

If you don't want to add VIT for Struggler there's Ultimi 3rd up with MATK+18% and absolute evasion +10%. Not sure how that compares to Struggler, might be good if you used Hicolon(s) on spec to get flat MATK from something.

It seems for now strug is still t strongest for magic armor

Theres several things that need to fulfill to get strug full power. Below theres detailed vit requirement to get full 700matk hidden bonus. Strug also bound to 3 weapon sword staff throwing

www.google.com/amp/s/aminoapps.com/c/imminent/amp/blog/hidden-struggler/kwaX_Jl6fGu7r3mz0koYo5LZdaxj41ea0r6
Several times guild mate ask bout strug hidden. Seems not yet any full satisfaction answer when i try search web. This still not exactly a right answer also tou.

I try linier aproximation. We can see from t table its not a perfect linier pattern. I got this linier formula

VIT = 284 - (0,42 x LEVEL)

Still hv error bout 1-2 in value. Round down if meet decimal. It might useful for magic ninja that dont want too much vit but still gain strug hidden n extra survival lol

T table seems more than enough tou for char at high level above 300. Ok hope thats help. Have fun n enjoy t game...

Read more: irunaonline.boards.net/thread/19234/struggler-owo?page=4#ixzz6DbTinHVm

Struggler (Strengthened 2) [Armor] 📷
ATK: 10 DEF: 20
Spell burst +10%, Magic pierce +19% INT+8 MATK+5%, Magic R +15%
Spellburst +10% Magic Pierce +19% INT +8 Magic R +15% MATK +5% [Swords] [Canes] [Throwing] [X = 0.06 * VIT * 100] If [X > 700] then [X = 700] [MATK up by X]

As for second best below strug for magic armor is emido. It will hv new up also in future which make emido t strongest later in future 

Emido (Strengthened 2) [Armor] 📷
ATK: 25 DEF: 15
Autoskill+10%, Spell burst +12% C. time -25%, Magic+1%, Magic R -25% MATK+16%, Absolute evasion+10%
MATK +16% Absolute Evasion +10% Cast Time -25% Autoskill +10% Spellburst +12% Magic Power +1% Magic R -25% MaxMP +15%
Notes: DEF = Emido (Strengthened 1) +3 ATK = Emido (Strengthened 1) +5, hidden correction: MaxMP

Emido (Strengthened 3) ATK: 25, DEF: 15 MATK +20% Absolute Evasion +10% Cast Time -30% Autoskill +10% Spellburst +14% Magic Power +2% Magic R -30% MaxMP +15%

As for t 3rd might be boo

Bellow of Order (Strengthened 1) [Armor] 📷
ATK: 10 DEF: 25
Melee&Magic R +13%, ATK up by STR MATK up by INT, Skill delay -1.2sec Damage cut chance by defense
Melee R +13% Magic R +13% Skill Delay -1.2s [X = 1.20 * STR] [ATK up by X] [X = 1.20 * INT] [MATK up by X] Autoskill

As for ultimi rank t 4rd place as magic armor yet still hv to struggling with new hulam nemes up in term of magic performance

Ultimi (Strengthened 3) [Armor] 📷
ATK: 8 DEF: 25
ATK+14% MATK+18% Accuracy+100 Melee+900 Delay-1sec, Critical up Absolute evasion +10%
ATK +14% MATK +18% Critical rate +10 Critical damage +10% Skill Delay -1.0s Item Delay -1.0s Accuracy +100 Absolute Evasion +10% Melee +900

Hulam Nemes (Strengthened 3) [Armor] 📷
ATK: 5 DEF: 22
MATK+13% MaxHP+2500 INT+8 DEX+10 Magic pierce +22%, Range cut +5% Skill delay -1.7sec
MATK +13% Magic Pierce +22% INT +8 DEX +10 MaxHP +2500 Skill Delay -1.7s Range cut +5% [X = 3.00 * Lv] [Magic Power up by X]

It’s really easy to get a 2s emido. The magic r does suck but it beats a 1s struggler with the right setup