Rhabdom presents a unique challenge as the initial mobile boss in Saros, distinguishing itself from prior stationary adversaries. This enemy actively pursues the player, employing slashes, leaps, and projectile-vomiting attacks. To enhance readiness, players are advised to equip the Damage Enhancement II protection and the Artifact Destruction trial modifiers. The latter offers a free advantage if players intend to revisit Passage post-run, while the former passively boosts damage output.

While no specific upgrades within the Armor Matrix are strictly mandatory, investing in attribute enhancements, restoration upgrades, and weapon proficiency nodes is always beneficial. Given Rhabdom's mobility, maintaining distance is key, making shotguns less ideal. Instead, weapons with an autohit feature are highly recommended for consistent damage. A weapon level of 30 is optimal, though anything above 25 is manageable. The introduction of Overdrive during this stage significantly impacts the boss's health, reducing the sole reliance on weapon damage. Players should endeavor to charge their Overdrive by engaging other enemies before confronting Rhabdom.

The confrontation with Rhabdom unfolds in an oval-shaped arena featuring a higher platform accessible via grapple points in each corner. These platforms, along with small staircases in the central flat area, can be strategically utilized for cover. Additionally, small aether orbs are located in each corner, providing health replenishment when needed. Rhabdom possesses a single health bar, but its attacks inflict substantial damage. Initially, four distinct attacks define its pattern:

• Yellow slashes: Rhabdom unleashes five slashes, each accompanied by a yellow projectile, with the final strike launching three. These can be evaded by dodging or lateral movement. Environmental elements like stairs and platforms can also partially block these projectiles.
• Yellow rings/Stomp: Rhabdom stomps, generating expanding yellow rings at varying heights. The center of these rings is filled with yellow orbs, necessitating a grapple to the higher platform for avoidance. These orbs persist on the ground before ascending.
• Homing blue projectiles: A blue flash precedes the release of a blue orb that fragments into homing projectiles, requiring precise dodging or shield usage. This typically follows a stomp.
• Leap: Rhabdom leaps towards the player, slamming the ground and dispersing red orbs. This sequence repeats three times. Dodging away mid-air is crucial to avoid both the leap and the subsequent projectiles.

The most effective tactic against Rhabdom involves continuous circular movement around the arena, utilizing the grappling hook when the boss closes in. Regular deployment of power weapons and Overdrive, when fully charged, is also vital.

Upon reaching half health, Rhabdom introduces two new attacks:

• Homing yellow projectiles: These replace the homing blue projectiles, requiring similar dodging maneuvers.
• Yellow vomit: Rhabdom expels yellow projectiles and actively chases the player. This attack is exclusively performed on the lower level, making grappling to a higher platform a safe evasion strategy.

All other attacks persist unchanged. The key to victory lies in sustained movement, timely use of power weapons and Overdrive, and consistent offensive pressure until Rhabdom is vanquished.

To summarize, success against the Rhabdom boss in Saros hinges on strategic preparation, understanding its attack patterns, and adeptly utilizing the environment and new abilities. By carefully selecting modifiers, prioritizing appropriate weaponry, and mastering the art of evasion and counter-attack, players can effectively mitigate Rhabdom's threats and secure their progress in the game. Constant movement, intelligent use of grapple points, and well-timed deployment of Overdrive are paramount to overcoming this dynamic and challenging encounter.