Hervor is a Generation 12 Infantry Hero. You can unlock her through Hall of Heroes and Foundry Shop. After generation 12, you can also get her through Daily Deals.
Exploration

Hero Attack: 13,674
Hero Defense: 17,826
Hero Health: 267,398

Earthmover
Hervor hammer-strikes the ground with thunderous force, inflicting Attack * 140% damage to frontal enemies, a 1-second stun, and Intimidation that reduces enemy Attack by 25% for 3 seconds.
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Damage Up: 100% / 110% / 120% / 130% / 140%

Mountain Strength
Hervor’s miraculous strength is terrifying to behold, granting her normal attacks a 25% chance of inflicting “Intimidation” which increases enemy damage taken by 15% (max 3 stacks).
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Probability Up: 5% / 10% / 15% / 20% / 25%
Enemy Damage Taken Up: 3% / 6% / 9% / 12% / 15%

Stone Arms
Brutal mountain life has endowed Hervor with superhuman endurance, reducing her damage taken by 25% and becoming immune to stun, paralysis or freeze and other control effect for the first 9 seconds of battle.
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Damage Taken Down: 5% / 10% / 15% / 20% / 25%
Expedition

Infantry Attack: +1451.16%
Infantry Defense: +1451.16%

Call For Blood
Hervor’s heartfelt war cry ignites fearlessness in her soldiers, increasing all troops’ Lethality by 25%.
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Lethality Up: 5% / 10% / 15% / 20% / 25%

Undying
The enemy menace pales beside Hervor’s icy homeland, her Infantry’s Damage Taken from Normal Attacks is reduced by 25% and 30% from enemy skills.
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Normal Attack Damage Taken Down: 5% / 10% / 15% / 20% / 25%
Skill Damage Taken Down: 6% / 12% / 18% / 24% / 30%

Bloodthirsty
Hervor and her Infantry are singularly devoted to the idea of battle, reducing her Infantry’s damage taken by 15% and increasing their damage dealt by 10%
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Damage Taken Down: 3% / 6% / 9% / 12% / 15%
Damage Up: 2% / 4% / 6% / 8% / 10%
Widget

Hammer of Sathla
Max Level Stats
Power: 1,806,750
Hero Attack: 2,770
Hero Defense: 3,613
Hero Health: 54,202
Escort Attack: 923
Escort Defense: 1,204
Escort Health: 18,067
Infantry Lethality: +362.50%
Infantry Health: +362.50%

Mark of Chieftain – Exploration Skill
Hervor’s hammer is a glorious symbol of Sathla’s power, increasing Attack Speed by 30% and normal attacks’ chance of “Intimidation” by 25%.

Fort of Rock – Expedition Skill
Hervor’s reforges defenders in her unyielding image, increasing Defender Troops’ Defense by 15%.
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Defender Troops Defense Up: 5% / 7.5% / 10% / 12.5% / 15%