Alternium Reactor

The Alternium Reactor system was introduced to the game with the August 9 2023 update. It basically takes old characters and tries to make them more relevant in the current meta by adding some new features or passives to their kits.

The Pure Possibilities item needed to AR a character are pretty rare and you can't farm them - they are only obtainable through events and login calendar.

Below you can find the list of characters who can unlock their Alternium Reactor and what bonuses they receive if they do so:

Character	Effect
	While Hilde exists on the battlefield, ally units are granted one barrier, each worth 8% of Max HP, that cannot be canceled.
	Immune to Blindness Grants Counterattack Buff of Passive Skill after using Special Skill, and increases ATK by 12% permanently for all counterattacks activated (Up to 10 stacks). In PVE, first deployment grants 3 stacks
	ATK +20%, Passive Skill's buff available to self, additional damage on Air units upon deployment is gauranteed to CRIT (Ships excluded)
	HP +35%, performs enhanced attack after every 6th incoming damage instead
	Passive Skill's ATK buff to self and telekinetic rifle changed to <b>+10%</b> (Up to <b>+50%</b>). Special Skill triggers the same effect activated by an enhanced attack.
	When HP drops below 1%, uses Special Skill regardless of cooldown and becomes Immortal that is removed after taking 10 hits.
	On top of the existing passive effect, inflicts the target enemies with a debuff that decreases their HP per sec (cannot be canceled, Bosses excluded). This debuff is 3% when there is one enemy unit within range and is decreased by 1% for every additional enemy unit within range (Min 1%).
	ATK +50% during enhanced attacks instead. Additional DEF Penetration +50% during enhanced attacks.
	Anti-Soldier/C.O. DMG <b>+3%<b>, ASPD <b>+2%<b> (Up to 15 stacks, -1 stack every 5 seconds) upon death of a creature summoned by Edel. Summons 5 additional creatures in front of Edel when casting Special Skill, Ultimate Skill.
	DEF +30%. Gains immunity to Hitstun from Special or lower skills for 12 s instead. If an ally Laika existson the battlefield, gains immunity to Hitstun from Ultimate or lower skills instead
	ATK +20%, activates Passive Skill's cooldown decrease after every 4 basic attacks
	Special Skill cooldown -8s upon Passive Skill activation, Passive Skill's Healing Extort changed to <b>50%<b> and also applies to enemy Strikers.
	Special Skill's DMG is increased by 50% and inflicts True Damage. Immune to damage while casting Special Skill. Enters Perfect EVA for 15s after casting.
	While Passive Skill is active, <b>+100%</b> ASPD and x2 Fury count.
	Becomes Immune to damage during the enhanced attack and casts an extra enhanced attack upon 10 evasions.
	Deployment Resource +2 when there is an enemy with 12 or more stacks of Chill on the ground upon casting Ultimate Skill (Limited to 2 times per deployment).
	ASPD buff of Passive Skill lv. 5 changes to 20% (up to 60%), Passive Skill's first attack always crits.
	Summoned Bulwark's HP +20%, [Assault Strategy Bulwark AGS-9A] provides Kyle Wong with DMG Transfer 50% and DMG RES Penetration 30%.
	Status Effect RES +40%. While Lee Jisoo exists on the battlefield, inflicts enemy Ranger, Striker, and Sniper units with a Skill Haste -75% debuff for 12 s (cannot be canceled).
	Deployment Resources +1 upon deployment.
	HP <b>+22%</b>, EVA <b>+40%</b>
	Attack +30%, Enhanced attack's DMG +80%.
	Gretel's HP +100%, DMG TLRNC +2%. Hansel's ATK +50%
	When Lulu falls asleep, inflicts all enemies on the battlefield with Seal Skill and HP loss per sec 3% debuff for 5 seconds (Bosses excluded). If the effect is activated within 5 seconds of deployment, the debuff duration is doubled.
	Unawakened units additionaly gain 1s of Stun when Passive Skill is activated.
	ATK +20% for 7 s upon summoning a sword on the battlefield. Also, permanent Ultimate Skill DMG AMP +3% per stack when summoning a sword (Up to 10 stacks).
	Nullifies barrier for 12s to enemies hit by Special Skill.
	Enhanced attack is activated after every 3rd basic attack instead. Enhanced attacks decrease Special Skill cooldown by 4s.
	ATK <b>+30%</b>, resets Special Skill cooldown when using Ultimate Skill.
	ASPD +20%, gains immunity to Hitstun from Special or lower skills for 6 s when deployed or casting Passive attack, creates a barrier worth 30% of Max HP.
	Every time any unit in the field is killed, increasing Skill Haste changes to <b>2%</b> (Up to <b>30%</b>). Also, Ultimate Skill DMG AMP <b>+2%</b> (Up to <b>30%</b>) and Lv. 5 Passive Skill's Ultimate Skill cooldown reduction changes to <b>1.4s</b>
	Deployment Resources +1 upon death, Special Skill changed to multi-hit attack (2 times) and its total DMG +20%
	Enhanced attack activated after casting Special skill, Special Skill cooldown -1 s when hit every 2 s.
	When buffed with Rasta Blasta, she gains immunity to Hitstun from Ultimate or lower skills and all attacks are treated as an Ultimate Skill Hitstun.
	The orb is created on every 9th basic attack hit instead. Orb's DMG +50%.
	Ultimate Skill Cooldown -3 s when casting Special Skill and nullifies buffs for 2s to targets who are hit by Special Skill.