Omega Sherro Boss Guide - Echoback Landing

The coastline duelist of Echoback Landing

Omega Sherro is the Omega boss of Echoback Landing — one of the three quest-gated weekly challenges (see the world bosses overview). Its base creature, Sherro (NO.055), is a Water-element DPS with 509 total attributes, HP 100, and ATK 121 per the official companion wiki — a sword-and-shell fighter whose lore says it turns its old shell into weapons to protect the Shellies along the coastline.

Unlocking the fight

The kit you are fighting

The live fight script is now documented — AniimoTools publishes the in-fight notification beats (accessed October 5, 2026): a Shelly grants Sherro a shield that reflects attacks, and the prompt is to defeat the Shelly first. The official Aniilog page shows the kit it is built from — and the design brief is unmistakable: everything scales near water.

• Tidal Heart — its trait adds +25% Water damage for 20s while in water terrain or after absorbing water.
• Water-amplified slashes — Flowing Water Slash (three-hit combo into a bonus heavy slash) converts to water blades near water for extra damage; Torrent Slam’s puddles add damage and a damage amp; its Torrent Blade ultimate (power 160) greatly extends its range the same way.
• Sustain and armor — Prismana Slam grants Super Armor for 5s near water, and Hydro Roll trades stamina for ram damage while regenerating stamina mid-roll.

The tactical read writes itself: the fight location is the difficulty dial. Near the shoreline Sherro is at full power; pulled inland, most of the kit’s bonuses fall off.

Team preparation

• Elements: Water defender — bring Lightning, Ice, or Grass damage (1.6x); Fire, Water, Earth, and Dark are resisted (0.625x). Full grid in the type chart.
• Terrain control: if the arena allows repositioning, fight away from water — the single biggest damage reduction available costs no team slot.
• Sustain check: between armor windows and rolling sustain, expect a longer fight than Infergon — a Support slot pays off (the team composition guide covers the framework).

Rewards

The verified reward is the evolution unlock: defeating Omega Sherro lets a Sheldon evolve into Sherro — the live conditions are Aniimo level 39, the Omega defeat itself, and one Wave Stone (live-verified: AniimoTools + Aniidex, accessed October 5, 2026). Each Omega’s chest can be claimed three times a week (AniimoTools’ FAQ quoting the in-game note; AniimoVerse’s drop database carries the same weekly-3 claim limit — accessed October 6, 2026). Beating Omega Sherro in the field leaves a chest whose reward lines are now live-documented (AniimoVerse drop database, single-source, accessed October 6, 2026):

Safaris and Windborn Stamps are fixed; the material and Credits lines scale with your level when the chest opens, and per-item odds are not published for them. Star Dust and Star Sand are two of the three materials behind Capability Awakening. The other two Omegas are Omega Infergon (Russet Highlands) and Omega Tuckin (Mistwoods).