Zeus gives boons that add chain lightning to abilities, or cause lightning to strike nearby enemies.
If given Nectar, Zeus will give you the Thunder Signet.
Zeus' affinity gauge is maxed out at 7 hearts.
Zeus' favor involves hearing the other Gods' opinions of him, as well as seeing Zeus express a desire to reconnect with Hades, along with Hades' response.
Zeus boons mostly revolve around two main effects. The first is chain-lightning. Chain-lightning effects will bounce between enemies, dealing damage to each enemy they bounce to. Additionally, Zeus also can grant lightning bolt effects, which cause a lightning bolt to strike an enemy, dealing damage in an area around it. These are both considered "lightning effects" and can be improved or amplified by other Zeus boons, such as Static Discharge, which adds the Jolted effect to all of your lightning effects.