Upgrading your arms in Hades is the key to conquering the underworld and consistently reaching the surface world. While initial escape attempts rely heavily on temporary boons and base combat abilities, permanent weapon enhancements dramatically increase Zagreus' power. Understanding how to unlock weapon Aspects and invest rare resources allows players to tailor their playstyle for optimal boss encounters.

Unlocking the Weapon Upgrade System

Before you can apply permanent upgrades to your weapons, you must first unlock all six Infernal Arms using Chthonic Keys in the Courtyard. After securing every weapon and reaching the final boss room, returning to the armory reveals interactive red auras over your arsenal. Inspecting an equipped weapon's slot opens the Aspects menu, where permanent enhancements become accessible.

Collecting and Spending Titan Blood

Titan Blood serves as the primary currency required to strengthen weapon Aspects throughout your escape attempts. You can obtain this rare material by defeating major region bosses with different weapons or trading at the Wretched Broker. Investing Titan Blood into base or secondary Aspects increases attack speed, damage multipliers, and special combat effects.

Temporary Upgrades with Daedalus Hammers

In addition to permanent Aspect upgrades, Daedalus Hammers offer powerful temporary modifications during individual underworld runs. Collecting these hammers modifies basic attack patterns, adds armor-breaking capabilities, or alters special abilities. Combining strong permanent Aspect levels with synergistic hammer modifications creates devastating combat builds.

Unlocking Hidden Weapon Aspects

Each Infernal Arm possesses a secret, fourth Aspect that offers completely altered move sets and significant stat changes. To access these hidden forms, players must invest at least five Titan Blood into a weapon's initial Aspects and speak with specific underworld NPCs. Listening to special waking phrases from characters like Nyx, Achilles, or Chaos grants access to these ultimate mythological weapons.