Undertale Yellow Zenith Martlet Fight

4.2(10)

Undertale Yellow Zenith Martlet Fight | The Genocide Route's Final Wall

Released:October 21, 2025

Alternate universe Undertale

🎮 Controls: Arrow keys to move (hold X for slow soul), Z to select, X to unselect.

👨‍💻 Created by dino7597 on Scratch.

Zenith Martlet with cosmic wings, the Genocide Route Final Boss

The Zenith Martlet Fight is the final, climactic boss of the Genocide Route in Undertale Yellow. The once-gentle Martlet, having witnessed Clover slaughter every monster, makes the ultimate sacrifice: she injects herself with all the DETERMINATION she can find, transforming into the 'Zenith of Monsterkind' to stop Clover. This fight is widely regarded as Undertale Yellow's peak difficulty, designed to push players to their absolute limit.

Zenith Martlet Battle Guide: The Ultimate Danmaku

Martlet's fight in Undertale Yellow is a multi-phased endurance test defined by extreme bullet density and cosmic-themed attacks. Clover faces her at LV 19 (maxing out at LV 20). Martlet, initially Clover's friend, becomes the Underground's last, desperate hope. Her transformation is a tragic yet heroic act, embodying a 'Justice' that directly opposes Clover's own twisted definition.

Attack Pattern: Hyper-Density & Cosmic Force

Martlet's attacks blend her avian traits (feathers, wind) with the immense cosmic power derived from DETERMINATION. The Genocide finale is defined by its sheer bullet density and varied, multi-phased patterns:

•Feather Storms & Ice Rain: She unleashes massive volleys of star-textured feathers and ice crystals that spiral, wave, or fall in complex grid patterns, demanding extreme micro-movements.
•DETERMINATION Trackers: Attacks include powerful, homing red/gold beams and large blades that lock onto Clover's position, making the precise use of the DASH ability mandatory.
•Cosmic Patterns & Wing Slams: Martlet generates rotating 'Cosmic Clock' patterns and performs swift Wing Slams that limit the safe zone, testing the player's ability to maintain a constant dodging rhythm.
•Multi-Phase Endurance: The battle features several distinct phases, each introducing new, overwhelming combinations that push the player's stamina and adaptability to the absolute limit.

Winning Strategy: Shooting and Survival

This is a pure FIGHT. Players must utilize Clover's offensive and defensive capabilities to survive and retaliate:

•Enhanced Yellow SOUL: Clover's SOUL gains a powerful Charged Shot ability in this fight. Mastering the timing of these high-damage attacks while navigating the bullets is essential for a quicker victory. This advanced mechanic represents Undertale Yellow's peak combat challenge.
•Precision DASH: The DASH ability is mandatory for navigating the densest attacks. One mistake in timing can lead to death, demanding absolute focus.
•Pattern Recognition: Though seemingly chaotic, the attacks have underlying patterns. Survival requires intense memory and near-perfect execution of micro-movements.

Zenith Martlet Fight gameplay screenshot showing intense cosmic bullet patterns

Comments

Prove Your LV. Defeat the Zenith.

Begin the Battle!

Undertale Yellow Zenith Martlet Fight

Undertale Yellow Zenith Martlet Fight | The Genocide Route's Final Wall

Game Overview

Zenith Martlet Battle Guide: The Ultimate Danmaku

Prove Your LV. Defeat the Zenith.