Fire

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Easy in low level, annoying in level 11 and 12.
His strength lies in the possibility of stacking two of his AOE (The Fire Cannon attack and the revenge skill that triggers at certain hp threshold and comes with a stun), leaving you no time to heal yourself back up.
Remember to have a tank that sticks close to him so he doesn't shoot his penetration bullet through your whole backline.
Not to mention, if you focus too much in survivability, his lethal skill will trigger at the 45 second mark after the battle starts. So balancing between damaging and healing is a must!
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Name 	Description
Toh! 	Attacks and penetrates all enemies. No damage loss upon penetration.
This skill's effect can be negated by Penetration Block, but not by Projectile Resist.
Knocks nearby enemies back a distance of 200.
Fire! 	Marthis fires a cannon once every 7 seconds, inflicting Fire damage.
Inflicts Fire damage every 1.3 seconds for 6 seconds.
Machine Gun!	If HP drops to 60% and 30%,wildly fires a machine gun, stunning enemies for 2 seconds with damage
It's Time! 	45 seconds after a battle begins, fires a cannon and inflict tremendous amount of damage
Giant Body 	Marthis's hulking body ignores Knockback and Stun
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Foria/Tidecaller Irene and Ashes/Jin Bachmaul reduce his fire damage by a lot (40%/55% from Foria/Irene, 25% from Ashes/Jin Bachmaul, stacks multiplicatively) but you need either an Adventurer or a Shield Knight with high MSPD to stay close to the boss.
Keep (Jin) Anaris for knockback and stun resist just in case. Recommended to have on level 12 to increase your healing time after the Machine Gun! procced.
Even though his 1st skill says his normal attack will penetrate all enemies, it will not have enough range to reach your backline if you have units in front.
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1 Tank, 2 Ranged Damage Dealers, Up to 5 Healers/Buffers
*Damage Dealers
**Sylar / Hecate: Sylar and Hecate hate bosses.
**Ash : Decent physical damage boss killer. Downside is extremely fragile. (Not recommended on high level)
**Aside from those 3, any other strong single target damage like Arley, Juhong is ok.
*Tank
**Master: Jin Bachmaul (replacement if you don't have Ashes), Shamu, Layaul
***Aries, Edin (not recommend on high level cube)
**Elite: Yuma, Kentom
*Healers/Buffers:
**Core
***Wedding Dress Lin: Best damage buff.
***Elle: Best healing capacity
***Foria/Tidecaller Irene: Fire damage reduction
***Ashes: AOE damage reduction
**Optional
***Karan: Even more ASPD buff
***(Jin) Anaris: Stun and Knockback Resist (Become important at higher level cube)