Altina

Preferred IV: +ATK / -SPD

• Ragnell•Alondite's twice-hitting property, lower base Might per hit (10 as opposed to a normal unique weapon's 16), and Speed decrease makes an Attack Asset and Speed Flaw more optimal than anything else.

Weapon: Ragnell•Alondite

• The ever-so-valued built-in distant countering and ability to attack twice in any phase means Ragnell•Alondite can serve some serious blitz damage while saving Altina's A slot for other skills besides Distant Counter.

Assist: Reposition / Draw Back / Smite

• For general one-space rescue functionality and overall movement flexibility, Altina can't go wrong with the standard Reposition or its close neighbor Draw Back.
• Teammates in Aether Raids may appreciate the two-space launch offered by Smite. Said Assist allows you to test out traps without wasting a turn, as well as push allies to a desired area (such as Aether fountains or enemy range) faster.

Special: Twin Blades

• Twin Blades is Altina's default Special and needs no other alternative considerations as it will most likely outdamage its two-cooldown similars, Moonbow and Glimmer, thanks to Altina's great base Resistance.
• Ragnell•Alondite's twice-hitting property also means Twin Blade benefits from very frequent activation. In particular, using a Blade skill or outsourced cooldown support (i.e. Brave Lucina's Geirskögul) means this Special can activate on most counterattacks.

Passive A: Ashera's Chosen

• Altina's unique A slot not only takes away that pesky Bow weakness that plagues her Flier unit class (allowing her to escape bad one-round matchups against the likes of Legendary Alm), but it offers some beefy stat fortification through +6 Atk/Def under relatively easy positioning conditions.

Passive B: Vantage

• Intelligent Systems clearly had a playstyle in mind when they gave Altina Vantage, and Altina fortunately uses this to a great extent. Any opponent forced to engage a Vantage-ready Altina must meet the full blunt of her twice-attacking Ragnell•Alondite, not to mention her Twin Blades Special if she has that ready. When prepared right, Altina can clear a mob of enemies with nary a scratch on herself.

Passive C: Def Smoke / Atk/Def Oath / Pulse Smoke

• Def Smoke massively improves Altina's performance against enemy mobs by inflicting -7 Defense on surrounding nearby foes, helping her clean up house even more easily as she effectively deals 14 more damage. For Aether Raids solo compositions, this is the surefire skill to go to.
• Altina doesn't need to look further than her default Oath skill for optimal yet low-investment deals, as the skill dually improves Altina's most important stats when next to any ally. If you are not using beast or dragon allies, however, it may conflict with Ashera's Chosen.
• Pulse Smoke is an awesome Aether Raids-centric option that increases the Special cooldown of her target and foes by +1; it is potent especially versus Infantry Pulse-centric setups where opposing units can threaten to ruin your offensive with hard-hitting precharged Specials.

Sacred Seal: Brazen Atk/Res / Heavy Blade / Fierce Stance / Brazen Atk/Def

• Brazen Atk/Res offers beefy additional Attack and Resistance bonuses of +7 each when activated and does so at nearly the same HP range as Vantage anyway. The added Resistance, in particular, improves the damage output of Twin Blades as well. Brazen Atk/Def may be taken if the added Defense is more valuable to you, or another unit is simply using its Resistance equivalent.
• With Heavy Blade, Twin Blades can potentially activate on any counterattack as long as Altina's Attack is higher than her foes'. Due to Ragnell•Alondite's lower Might per hit, it is good to exercise good Attack control (such as teammates using Chill Atk) when using Heavy Blade.
• For an immediate enemy phase-only Attack boost that works regardless of HP range, Fierce Stance is a pretty safe option compared to the setup-reliant Brazen Atk/Def.

Preferred IV: +ATK / -SPD

• For more frequent Heavy Blade activation and simple increase damage output in general, an Attack Asset is still preferred over other stats.

Weapon: Ragnell•Alondite

• Ragnell•Alondite's dual-phase capabilities and consecutive hitting behavior help Galeforce activate fairly frequently while reasonably allowing Altina to dish out damage in enemy phase when the situation calls for it.
• In particular, the weapon's twice-hitting property makes Altina a good recipient of Wolfpup Fang (Velouria's unique weapon), allowing her to precharge Galeforce and activate it in Altina's first match regardless of the enemy being able to counterattack.

Assist: Reposition / Draw Back / Smite

Special: Galeforce

• Galeforce requires consistently successful Special acceleration setup, but the payoff of an extra action after activation is huge; Altina can use the new opportunity to strike yet again or escape from enemy range.
• For Aether Raids in particular, Galeforce is valued especially in Galeforce-centric teams in which Altina and her teammates can dismantle entire closely-knit Defense setups in a single round thanks to abusing extra actions.  

Passive A: Ashera's Chosen / Heavy Blade 4 / Sturdy Impact / Mirror Impact / Atk/Def Bond / Atk/Res Bond

• Altina's default A slot is still relatively good as it provides a nice dual-phase offensive boost equivalent of Atk/Def Solo in addition to cancelling her Bow weakness. However, usage of both this and Wings of Mercy may be awkward on teams not particularly focused on using dragons and beasts.
• When its activation conditions are met, Heavy Blade 4 offers a neat true damage boost of +5 while helping Altina activate Galeforce at a practical rate. However, it requires Altina's Attack to be higher than her opponent's, which can potentially throw her off in some situations given her lower Might weapon versus higher-Attack targets. Additionally, for pure Attack comparison purposes, Ashera's Chosen + Heavy Blade as a Sacred Seal is more potent.
• Sturdy Impact and Mirror Impact specializes Altina in player phase moreso than usual; if you are willing to accept this, the defensive boosts and follow-up negation effect offered by both make dangerous initiations significantly safer.
• Given Wings of Mercy forcing adjacency to allies, Atk/Def Bond and Atk/Res Bond may be more up Altina's alley if the majority of said allies are non-beasts or non-dragons.

Passive B: Wings of Mercy / Vantage / Hit and Run / Drag Back

• Wings of Mercy is a potent movement-based skill that allows Altina to teleport adjacently to a weakened ally, giving her opportunities to support and escape from afar. In Galeforce-centric team setups (especially in Aether Raids), this is very valued as other Galeforce-using allies can open a chain for Altina to come in and attack and add further to the chain of assaults.
• Vantage is still a great B passive to fall back on as it gives Altina nice enemy phase performance—likely after she can no longer perform actions. Thus, this cushion's Altina's chances at getting heavily punished by enemies, and even allows her to charge Galeforce for its next activation in the process. Without a damaging Special, however, users should not overestimate how much she can do damage-wise.
• Other B slot skills of note include Hit and Run and Drag Back for movement flexibility purposes, as retracting to a previous space allows for ease of escapability.

Passive C: Atk Smoke / Pulse Smoke / Def Smoke

• Due to this build's emphasis on Heavy Blade activation, it follows that Altina's Attack should be higher than her opponents when necessary. Atk Smoke helps with just that, as it applies a harsh decrease of -7 Attack to surrounding foes relative to her previous target. In addition to easier Heavy Blade activation, it also allows her to better tank hits when necessary.
• Pulse Smoke enabling Altina to utterly dismantle Infantry Pulse-based teams by decreasing enemies' precharged Specials by one also makes it a valuable Aether Raids-based choice.
• Def Smoke instead improves Altina's damage output by targeting surrounding foes' Defense instead. Keep in mind that a higher damage output may mean accidentally stopping Galeforce from activating due to the first hit of Ragnell•Alondite potentially performing the KO rather than two hits being performed, resulting in less frequent activations.

Sacred Seal: Heavy Blade / Sturdy Blow / Atk +3

• Heavy Blade as a Sacred Seal is basically a requirement on all builds not already running it in the A slot, as Galeforce otherwise cannot activate at a practical rate due to its long cooldown.
• Otherwise, if Altina is benefitting from another source of cooldown acceleration, you may instead opt for Sturdy Blow for a greater player-phase Atk/Def boost, or Atk +3 for a flat offensive boost that works in both phases.