- "A mysterious weapon. Its abilities are unknown."
- — In-game description
The ES Axe, referred to informally in the fan community as the S-Rank Axe, is a rare saber-type weapon in Phantasy Star Online. This weapon was one of the rewards for completing Episode 2 online challenge mode in less than 5 hours, which earned the player an S rank.
This weapon's default name in-game is simply Axe in red font instead of white. It is visually distinguishable from Victor Axe by its brown photon glow.
The ES series of weapons were unique because the player that earned them could name them anything that they wanted within 8 characters. The only thing fixed about it was that the weapon type would add itself to the end of the name. For example, if the desired name is "PHANTASY," it would appear as PHANTASY AXE. The special attack was customizable by speaking to Paganini in the Gallon's Shop quest. He would trade an ability affix of the player's choice in exchange for Photon Drops.
ES Axe can only be equipped by HUmar, HUnewearl, HUcast, HUcaseal, RAmar, RAmarl, RAcast, RAcaseal, FOmar, FOmarl, and FOnewm.
| Character Classes | HUmar - HUnewearl - HUcast - HUcaseal - RAmar - RAmarl - RAcast - RAcaseal - FOmar - FOmarl - FOnewm - FOnewearl |
|---|---|
| Important Characters | Alicia Baz - Ash - Bernie - Calus - Elenor Camuel - Elly Person - Heathcliff Flowen - Kireek - Montague - Red Ring Rico - Rupika - Sue - Ult |
| Locations | Pioneer II - Forest - Caves - Mines - Ruins The Lab - VR Temple - VR Spaceship - Central Control Area - Seabed Crater - Subterranean Desert |
| Weapons | Sabers - Swords - Daggers - Partisans - Slicers - Handguns - Rifles - Mechguns - Shots - Canes - Wands - Rods Katanas - Claws - Double Sabers - Twin Swords - Fists - Launchers - Cards |
| Items | Weapons - Frames & Armour - Units - Barriers & Shields - Mags - Support Items |
| Techniques | Foie - Zonde - Barta - Gifoie - Gizonde - Gibarta - Rafoie - Razonde - Rabarta - Grants - Megid Resta - Anti - Reverser - Shifta - Deband - Jellen - Zalure - Ryuker |