|This is a budget build that focuses particularly on utilizing Arvis's amazing magic tanking capabilities. Unlike fellow red tome users on more favorable, extreme sides of the offensive spectrum, such as Celica and Tharja, Arvis's passable Attack and very average Speed don't exactly lend themselves to nuking or sweeping. However, Arvis's amazing Resistance gives him a niche similar to that of Sanaki and Lilina: the ability to go toe-to-toe with green tome users, which are some of the most common metagame-centric threats at this time of writing. Additionally, unlike Lilina and Sanaki, Arvis's natural Speed stat allows him to ever-so slightly avoid doubles from unusually built enemies, such as higher merged units, or slower units that choose to increase their speed through Speed boons and Fury 3. If you already own hyper offensive red mages such as Celica and Tharja, but want to find a niche for Arvis and/or require a specialty green mage counter in Arena or Arena Assault settings, this build is worth consideration.
The key difference between this set and other standard Arvis builds is the main use of Triangle Adept 3 rather than Fury 3. In particular, using the former skill enables Arvis to specialize even better against opposing green units: he will take significantly less damage from green tome users while dealing more to these enemies in return. For example, a typically buffed +10 Nino with Gronnblade+ and Fury 3 will double and KO if Arvis chooses to use Fury 3; if Arvis uses Triangle Adept 3 instead, he consequently persists with 15 HP. Therefore, Arvis can successfully bait and weaken/kill most green tome users slower or weaker than this, including Deirdre, Julia, and even fully Horse buffed Gronnblade+ Cecilia.
If your team would prefer to eliminate these threats immediately, Green Tomebreaker ensures that Arvis can bait, double, and kill pretty much any green mage outright. Additionally, Green Tomebreaker prevents a fully buffed Fury 3 Spring Camilla from doubling and killing Arvis instead. Most green magic threats aside from the provided examples, however, will not be able to kill Arvis in a similar manner, so Recover Ring can be used instead to recover quickly from skirmishes. In combination with either Reciprocal Aid or Ardent Sacrifice, Recover Ring allows Arvis to act as a pseudo-healer if your team requires such utilities. To expand Arvis's list of targets he can tank and counterattack, Red Tomebreaker improves his matchups with opposing Red tome units (such as Celica, partially-boosted Tharja, and opposing Arvis) instead. Swordbreaker similarly does the same with common sword units, though keep in mind that a number of them also have access to a weapon with built-in Distant Counter and will take advantage of Arvis's depressing Defense.
Valflame further drives in the supportive aspect of this set with its superlative debuff effects (it's essentially a free Attack and Res Ploy in one weapon slot) while being reasonably powerful on its own. It may be tempting to use Rauðrraven+ with Triangle Adept 3 for the added benefit of also handling colorless foes, though Arvis's low Defense makes him susceptible to overpowering from the likes of Quickened Pulse + Moonbow Brave Lyn. Additionally, Valflame's debuffs come in handy too often to pass up. The choice between Iceberg and Moonbow depends on whether you require a nice damage bomb or a stronger counterattack in enemy phase, respectively.
Arvis also comes with Def Ploy, which can be used to support his team, but it can also be switches for another skill, if it isn't needed or something else is required.