Jerome Halo Wars 2 Guide — Mastodons & Omega Team

This Jerome beginners guide is from Moes on the Team Respawn Discord — a high-level 1v1 player who peaked rank 2 and finished rank 18 last season. The plan is strongest in 1v1 and still useful in 2v2; 3v3 cares less about the opener, but the leader-power and Mastodon advice still applies. Pair this with the UNSC faction guide, our 2026 leader tier list, and the UNSC leader powers ranking.

Early Game Plan

Go into the match with a plan. Jerome's mid-game is his strongest window — if you win the early game, leftover Marines plus Mastodons make you more threatening than most other heroes.

Build Order

1. Supply Pad
2. Supply Pad
3. Generator
4. Supply Pad — extra supply and time to collect power before the hero
5. Armory for Jerome — fifth building, not queued at spawn

Do not queue all five buildings at the start. Queued buildings lock your supplies even before they start constructing, so you cannot afford Marines or a Jackrabbit. Build the first pad, then a unit, then continue the pad-pad-gen sequence.

Opening Units and Crates

• Open with two extra Marines in most games so you have more bodies collecting crates
• Split your starting Marines — mix supplies and power instead of sending both to the same side
• Keep one Marine close for nearby supply crates so the generator is delayed as little as possible after the second pad
• Shift-click crate routes so units move to the next bundle instead of idling
• Two power bundles should give you 300 power when the generator finishes so you can upgrade it immediately
• Four power bundles line up with building five in a row so Jerome comes out on time

Upgrades

• Upgrade the first Supply Pad as soon as it finishes — extra supply for units, minis, and crate control
• Upgrade the Generator as soon as you have 300 power — that points you at Tech 1, the hero, or Grenade Throw

Minis

• Ideal first mini timing is about 1:05–1:10 — spend as soon as you start floating
• Build on a mini the moment it finishes
• On three-mini maps this is expensive; four power crates is the minimum delay you should accept to still take all of them
• Fill every mini with Supply Pads and keep producing units

Marines vs Jackrabbits

Pick one and mass it. Mixing them does not cover each other's weaknesses — it just makes the army easier to fight.

• Marines on shorter or smaller maps: you take minis and nodes faster, and you can annoy the opponent sooner
• Jackrabbits on larger maps: speed lets them be in more places, at the cost of raw power. Massed they still deal significant damage
• Matchup matters too — if you expect to win the early game as Jerome, Marines leftover for Mastodons are a huge mid-game spike

Leader Power Setup

Moes currently recommends: Victory Mine → Restoration Drones → Mastodons → Victory Turret → Omega Team.

First Point: Victory Mine (skip Recon Training)

• Mines are a real combat spike — they can clear an army
• Pair them with the stun from dropping the Command Mantis on the enemy so they cannot run out
• Mines also inspire nearby friendlies, which is a straight stat buff if you drop them on your army
• Recon Training's extra line of sight is one of the weakest powers in the game — you still cannot shoot through fog, and tracking last-seen army position covers most of the value

Second Point: Restoration Drones (skip Time for Heroes)

• Heal is basic, but it actually does something for the rest of the game
• Time for Heroes only inspires until 40 population — if you play the early game well you are over that cap anyway, so the power falls off in winning games

Third Point: Mastodons (Enduring Salvo as the comeback pick)

• Mastodons are the default — they are extremely strong with Combat Tech Marines inside
• Load snipers or Cyclops and ground armies struggle to fight you; load enough Marines and air struggles too, especially with two or three Nightingales
• Enduring Salvo if you are losing and need to delete an army — high damage plus inspire. After Omega Team, this is the next point Moes likes

Fourth Point: Victory Turret (skip Spartan Morale)

• Drop the turret on a hero or expensive units (Johnson mechs, for example) to stun them
• You get a free window to kill the important targets while they cannot shoot back
• Spartan Morale is a short inspire. Mastodons are already strong enough that they do not need the extra stat burst

Fifth Point: Omega Team (skip Field Promotion)

• Three Spartans. Spartans win games — hijack vehicles, inspire, and close fights
• Veterancy from Field Promotion comes naturally; do not take it until the rest of the wheel is unlocked

Jerome Hero and the Mid-Game Spike

• Hero around 1:55 if the pads line up and you collected four power crates
• A slight hero delay is fine — Jerome is strong enough to make up the time
• Upgrade the hero (Command Mantis) when you have 400 power
• Rally new units onto Jerome
• Split some Marines so Jerome last-hits Sentinels and starts gaining veterancy before the real fight

Why Mastodons Reward a Winning Early Game

If you still have Marines when Mastodons finish, those Marines occupy them immediately. You get a much stronger army without a huge extra investment. That is why winning the early game as Jerome is more threatening than it is for most other heroes.

Combat Tech Marines do not heal a Mastodon from inside it. Overflow Marines that did not fit can still heal the Mastodons even before you have Nightingales. Grenade Throw on Combat Tech is especially strong against air.

Tech 2 Progression

Faster Tech 2

• When Command Mantis is about to finish, save a little supply, recycle the Armory, and build a second Generator
• Jerome wants Combat Tech Marines, and that requires Tech 2
• You should be past 40 population before 4 minutes, with a second generator going and three minis fully built, plus power nodes
• Scout earlier at a higher level; keep producing units the whole time

Second Base Timing

Go for a second base when Tech 2 finishes and you have the next 200 power. Park a Marine on hold position at that site. While Tech 2 researches, get the Armory back — preferably by recycling a pad on a mini so you can upgrade to the Tech 2 hero almost immediately when the research completes.

Garage vs Barracks

Next power after the hero upgrade goes into Grenade Throw. Then pick production based on what is left of your Tech 1 army:

• Garage if you still have a large Marine ball — 3–4 Mastodons filled with Marines, a couple of Nightingales, and Kodiaks shooting from behind to deal with counters
• Barracks if you do not have enough Marines to fill Mastodons — build the actual counter units instead of asking Kodiaks to do that job

Keep making Marines either way. Jerome's mid-game is his peak, before opponents have the power for real counters. Once your second base is up you can afford a third generator if you think Tech 3 will win, but most games do not need it — Mastodons, Marines, Nightingales, and Kodiaks are all low-power units. Focus the resources you actually spend.

Tech 3: Vultures, Not Scorpions

• Switch off Mastodons at Tech 3 — they fall off once Vultures exist
• Scorpions are the inferior tank; Vultures are the best Tech 3 choice for every UNSC leader right now
• The nuke ability lets you take efficient trades. Enough Vultures with Nightingales make fights very hard to lose
• They are expensive — sit back and bank a real count instead of dripping them out one at a time

Key Takeaways

1. Pad, pad, gen, pad, hero — do not queue the whole base at spawn
2. Upgrade the first pad and generator on time; two power crates for the gen, four for Jerome
3. Mass Marines or Jackrabbits, not both — Marines on short maps, Jackrabbits on large ones
4. Victory Mine → Restoration Drones → Mastodons → Victory Turret → Omega Team
5. Win the early game so leftover Marines fill Mastodons for a cheap mid-game spike
6. Combat Tech Grenade Throw is your anti-air; overflow Marines heal Mastodons from outside
7. Second base at Tech 2 plus 200 power; recycle the Armory for a second generator, then rebuild it for the Tech 2 hero
8. Garage if you have Marines left, Barracks if you need counters instead
9. Skip a third generator in most games; Jerome's mid-game is the win window
10. At Tech 3, Vultures and Nightingales over Scorpions and leftover Mastodons

Questions or disagreements? Ping Moes in the Team Respawn Discord.