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Basic Information

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Skill 1: Thunderous Roar

■ Activates after 5 normal attack(s). Affects all allies.
Roar: Critical Rate ▲ 2.62%, stacks up to 5 time(s) and lasts for 5 sec. 
■ Activates after 15 normal attack(s). Affects all allies with a Shotgun. 
Maximum Effective Range ▲ 20% for 10 sec.

Leona’s Skill 1 permanently buffs Crit Rate for the whole team after ~4s and reaches max buff after ~20s. Crit damage is heavily diluted in the damage formula, the actual increase from crit isn’t much in the grand scheme of things. Nevertheless, any extra damage is welcomed.

Moving on, after 15 shots (~12s due to reload) Leona increases the Maximum effect of Shotgun allies by 20%, this multiplier isn’t affected by skill level. Only the upper bound of effective range is increased, when a target is in effective range of a weapon (signified by crosshair changing to cyan color) damage dealt to that target will be increased by 30%. However this damage is not multiplicative, but additive to full burst, crit damage, and core hit modifiers (0.5 + 0.5 + 1.0). to save you from math, effective range damage bonus is basically ~10% total damage increase when factoring all these modifiers.

However, 20% range increase is not a large increase at all, and will only actually come in clutch in a very few scenarios, and that is, if the Commander is using a shotgun team.

Skill 2: Courageous Look

■ Activates when entering Full Burst. Affects all allies. Hit Rate ▲ 20.28% for 10 sec.
■ Activates when entering Full Burst. Affects 2 ally unit(s) with the highest ATK and a Shotgun. Increases number of pellets by 5 for 10 sec.

Leona buff’s hit rate for all allies during Full Burst, helps Rifle units score more core hits and tighten the spread on Shotgun units. Base hit rate for shotguns are abysmal (excluding Maid Privaty), buffing hit rate by a small amount won’t do much to increase shotgun DPS, see below illustration to see how different hit rate values affect shotgun spreads.

Maid Privaty has innate hit rate buff, her shotgun spread is fairly tight and hit rate buffs aren’t as effective on her as compared to other shotgun units, still a welcomed buff however.

During Full burst, Leona also increases the number of pellets fired per shot for 2 highest ATK shotgun units. Weirdly enough, this doesn’t increase damage dealt, it’s meant to synergize with pellet count mechanics (Maid Privaty). The break points for this skill are Lv4 (4 pellets), Lv7 (5 pellets). This also increase the odds of critical hits as they’re firing more pellets, basically more dice rolls.

Burst skill: Lion’s Heart

■ Affects all allies. Critical Damage ▲ 34.64% for 10 sec. 
■ Activates when the caster’s Roar is fully stacked. Affects all allies with a Shotgun. Critical Rate ▲ 21.32% for 10 sec.

Buffs everyone’s Crit Rate and Crit Damage, not the greatest burst effects as mentioned earlier Crit damage is heavily diluted in damage formula. Unfortunately the Crit Rate buff is locked to shotgun units.

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Campaign

Leona has good synergy with shotgun units but there aren’t many great shotgun DPS or ones with pellet-based mechanics to make use of her buffs. The notable shotgun units are Sugar, Maid Privaty and Noir who are fortunately not locked behind limited banners. At the time of writing, Maid Privaty isn’t available from Normal recruitment yet. Noir doesn’t have great personal damage but she provide beneficial buffs that synergizes with Shotgun units

Tove is also a great shotgun buffer as she has huge ATK buffs for those units, it’s recommended to use Tove as your Burst 1 unit for these teams. However other meta B1 units will also suffice (Liter, Volume, Dorothy).

Shotgun Nikkes, even with good kits, relatively do poorly in campaign, even in specialized teams simply because they are unable to hit. Maid privaty is the only shotgun Nikke so far that can hit raptures from a decent range.

Copium SG story team

Tove,Leona,Privaty: Unkind maid,Sugar,attacker

The main shotgun comp, this comp is missing a cooldown reduction unit, Sugar can be replaced with Noir. Currently there is no CDR burst 3 Nikke, and since shotguns barely hit targets, burst generation would be hard to fill. Meaning CDR won’t really be needed in the first place.

Tove wants to fully stack before bursting with her, to ensure maximum ATK boost, which help Privaty: Unkind maid to screen wipe easier.

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Arena

Leona’s a clip shotgun so her burst gen isn’t great, the utility she offers takes too long to take effect in PVP environments so she has no use in PVP.

Special Interception | Union Raid | Solo Raid

Leona outside her specialized team (Privaty Maid team/Shotguns) is a below average burst II Nikke buffer. Providing Crit rate and crit damage. However, her optimal team is strong enough to be in the top 5 teams in Solo raid depending on boss.

Extended Full Burst Team (Solo Raid)

Tove,Leona,Privaty: Unkind Maid,Modernia,Marciana

Team that tries to mitigate the lack of Cooldown reduction of this team via Modernia extended full burst timer while also provident very sufficient healing. Always try to time Tove burst when her stacks reaches 3.

Shotgun Team (Special Interception)

Tove,Leona,Privaty: Unkind Maid,Anis: Sparkling Summer,Maiden

Team that’s fully orientated for shotgun lovers. Anis: Sparkling Summer and maiden can be replaced with any shotgunners of your choice. One of the shotgunners can be replaced with Helm/Marciana if healing is needed.

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Stregnths

• Provides good buffs for shotgun teams as a solo burst II Nikke
• Primal Seggs

Weaknesses

• Very mediocre outside shotgun teams
• can be easily replaced if better Burst II Nikkes come out, even in shotgun teams
• Her Optimal team requires heavy investment