Mission 1: Osiris
Osiris introduces Fireteam Osiris through a high octane assault across the frozen battlefields of Kamchatka. My work as a mission and level designer focused on creating a fast, kinetic opening experience that showcased Spartan mobility, four-player squad combat, and helped establish Fireteam Osiris as a compelling playable perspective alongside the legacy of Master Chief.
The mission begins with Fireteam Osiris hot-dropping into an active warzone to retrieve Dr. Halsey. From the start, players are placed inside a dynamic battlefield where Covenant and Promethean forces are already in conflict, allowing Osiris to move through the chaos as a highly capable Spartan fireteam.
Structurally, the mission introduces Halo 5’s new movement language while maintaining the clarity and pacing of a campaign opener. Clamber, Spartan Charge, Ground Pound, and squad commands are taught through layered combat spaces that support both aggressive assaults and more deliberate positional play.
The mission gradually expands in scale, moving from smaller enemy-vs-enemy skirmishes into an epic hillside charge. Its strength is in how it delivers the scale and spectacle of a larger war while giving players space to re-familiarize themselves with Halo and learn new mechanics through action.
Overview
Encounter Highlights
The Checkpoint encounter was designed as a mid-sized exterior battlefield where players assault a Promethean fortification. The goal was to create a space where players could exercise agency, experiment with Halo 5’s new abilities, and still maintain a clear read on combat fronts, enemy positions, and tactical opportunities.
The encounter take place on a broad snowy hillside leading toward a clearly defended exit, elevated ledges, flank routes, breakable ice walls, and mid-range sightlines to support multiple approaches. Players can hold high ground and dismantle Promethean forces from range, push the main path alongside the Covenant, or use side routes to flank entrenched Soldiers and turret positions.
The level design also supports the player's new traversal verbs. Clamber routes, Spartan Charge paths, Ground Pound opportunities, and elevated sniper perches encourage players to explore the space vertically instead of simply advancing down the main path.
The strength of the encounter is that it lets players choose their own level of friction. Cautious players can use range, cover, and squad positioning to control the fight methodically, while aggressive players can push into the lower battlefield and create more volatile combat moments.
Checkpoint
The Hillside encounter was designed to deliver scale, spectacle, and cross-faction combat while delivering on the player fantasy of a final push through an active warzone. The sequence escalates with the reveal of the Covenant Kraken, reinforcing the sense that Fireteam Osiris is advancing through a conflict much larger than the immediate combat space.
The core design challenge was balancing battlefield scale with the clarity and pacing required of an opening mission. To support that, the encounter uses strong landmarking, elevated overlooks, readable routes, and staged combat fronts to keep players oriented, pressured, and moving forward without overwhelming them.
The space gives players a range of tools and tactical options to solve smaller combat problems that build into a larger battlefield experience. Through layered scripting, 3 way combat, and wide-open level design, the encounter creates a layered combat experience that delivers on the spectacle and fantasy of the larger conflict.
Hillside
The final encounter of the mission shifts from the broad exteriors into a tighter Forerunner arena, creating a deliberate change in pacing, intensity, and challenge. After pushing through larger combat spaces, the player enters a more focused encounter where Promethean Knights become the mission’s heaviest direct combat test.
The goal of the encounter was to deliver a clean escalation into a high-threat enemy showcase while reinforcing the player’s core combat loop: observe the threat, identify opportunities, and act on tactical choices. The player gets a clear introduction to the Knight before the fight fully opens, allowing them to understand its scale, power, and vulnerability windows. From there, the encounter asks players to manage armor stripping, core targeting, and ammo pressure while pushing into the arena and engaging the Knights and their supporting units.
The fight works because it narrows the player’s focus after the larger exterior battles and brings the mission back to grounded Halo combat. Instead of broad battlefield navigation, the emphasis becomes precision, resource management, target prioritization, and coordinated team support.
Knight Fight
