Besides the usual support Kratos receives during combat inGod of War Ragnarok, he is also able to use special skills for each of the three weapons he possesses. By collecting and using Light Runic or Heavy Runic attacks, Kratos will have a chance to either stun the enemy or inflict massive elemental damage according to the wielded weapon.
Just like any weapon inGod of War Ragnarok, the Leviathan Axe has Light Runic attacks and Heavy Runic attacks. The latter usually causes more powerful damage or stun than the former. These attacks are either obtained by completing quests from The Path or while doing a Favor.

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All Leviathan Axe Heavy Runic Attacks Location in God Of War Ragnarok
The Leviathan Axe’s special skillscan be found in many Realms inGod of war Ragnarok, usually inside a Legendary chest. The weapon also has the same amount of Heavy Runic attacks as its Light Runic attacks, which is five. Here’s every location for the Heavy Runic attacks:
Unfortunately, one of the Runic attacks is related toa very lengthy Favor inGod of War Ragnarok.

Description
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A massive ice wave that inflicts frost damage and freezes enemies in its path.
While exploring the Myrkr Tunnels in the Forging Destiny chapter, a Legendary Chest will be guarded by some red flowers. Simply shoot a Sigil Arrow and use the Blades of Chaos to ignite them. Be careful of the huge explosive barrel next to it.

A lingering area-of-effect attack that creates a small hazard, inflicting Frost status to all enemies inside.
The Mists of Helheim can be obtained after completingThe Reckoning chapter inGod of War Ragnarok. However, it can only be reached by following a specific path starting from Cliffside Ruins. It’s also possible to trigger Conscience for the Dead Favor for easier navigation. To get the Runic attack, follow the steps below:

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The chest contains the Mists of Helheim Heavy Runic attack. Goddess Falls is also where Freya’s Missing Peace Favor will take place.
A powerful axe throw that returns with devastating impact. Kratos is fully protected while shielding.

East of Freyr’s Camp where players once fought two Drekis, look northwest and usethe Draupnir Spear inGod of War Ragnarokto make the wall climbable. Go up then proceed southeast and climb another edge until players reach the Legendary Chest.
A massive area-of-effect attack that deals damage to all enemies within an extremely large area

Breath of Thamur is arguably the strongestHeavy Runic attack inGod of War Ragnarok. Sadly, it requires a bit of work since players must follow Odin’s Raven Favor and collect 28 Ravens to open the Legendary Chest containing the Runic attack in Niflheim.
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A staggering area-of-effect attack that deals Frost status to all nearby enemies.
DuringThe Word of Fate quest inGod of War Ragnarok, it is possible to find Ivaldis Anvil Heavy Runic Attack. After fending off a couple of enemies in The Derelict Outpost, head west and enter a door. Break the icicles, leap down, pull the chains, rotate the mechanism, get back up, and swing to the other side. From here, leap up and open the Legendary Chest to obtain the Ivaldis Anvil Heavy Runic Attack.
God of War Ragnarokis available now for PS4 and PS5.