RECURRING EVENT

Operation: Plague Star

You poison the Infested boil that has crashed into the Plains of Eidolon and put down the Hemocytes that crawl out of it. The reward currency is standing: Plague zaw parts, the Ghoulsaw and the Exodia arcanes all come from Nakak in exchange for it.

Soon

September 9 at 04:00 PM — September 23 at 04:00 PM (UTC)

Plains of Eidolon · Cetus (Earth)

Bounty from Konzu Cetus

Reward vendor Nakak Operational Supply

Stages 4 toxin → mix → drone → boil

Difficulty 3 tiers normal · advanced · Steel Path

How the mission works

1 · Steal the Thrax Toxin
Marked on the map
One of the caves out on the Plains holds a Grineer Thrax Toxin stash. You go in and take it.

Tip The cave changes every run — follow the waypoint instead of searching for it.
2 · Defend the mixture
Marked on the map
You carry the toxin to the mixer at a Grineer camp, then defend it for three minutes against the Grineer counterattack.

Tip The timer is fixed — you cannot finish it early. Spend those three minutes clearing the Grineer around you so they are not on your back in the next stage.
3 · Escort the drone to the boil

A salvaged Grineer drone hauls the toxin to the boil. It takes fire from both Grineer and Infested along the way, and you are what keeps it alive.

Tip Keep the drone above 80% health and the run pays a standing bonus at the end. It is the only real bonus on offer — stay near the drone.
4 · Poison the boil

A progress meter fills while the toxin rots the boil, and you hold off the Infested wave. On Advanced and Steel Path, Hemocytes spawn during this stage.

Tip Hemocytes arrive one after another, each ten levels above the last. Bring single-target damage rather than area damage.

Where the stages are

Stages 1 and 2 move every run. Every cave and camp candidate below is inside the Plains of Eidolon.

Plains of Eidolon map — 1 **Caves (12)** Stage 1 — the Thrax Toxin is in one of these
2 **Grineer camps (6)** Stage 2 — the mixer is at one of these

The boil is marked during the mission and the drone takes you there anyway. What the map shows is the candidates for the two stages that move around.

Consumables

These are what unlock the Advanced and Steel Path tiers. Every member of the squad has to carry one of each; they are spent automatically when the mission starts.

Eidolon Phylaxis

Unlocks the Advanced and Steel Path bounties. Spent automatically when the mission starts; you never use it by hand.

Blueprint from: Nakak · Operational Supply Rank 1 (Collaborator) — blueprint 2,000 standing + 4,000 credits
Per build: 5 units · 1 minute

500 Credits
15 Iradite
20 Grokdrul
10 Nistlepod

Infested Catalyst

The twin of the Phylaxis: for the advanced tiers, EVERY member of the squad has to be carrying one.

Blueprint from: Clan dojo · Bio Lab research — blueprint 5,000 credits
Per build: 5 units · 1 minute

500 Credits
500 Plastids
2.300 Ferrite
1.800 Nano Spores

Preparing to run it back to back

Advanced tiers need two consumables

The Advanced and Steel Path bounties require EVERY member of the squad to carry one of each in their inventory. They are spent automatically when the mission starts; you never use them by hand.

Eidolon Phylaxis — blueprint from Nakak at Rank 1 (Collaborator), 2,000 standing + 4,000 credits
Infested Catalyst — blueprint from the Bio Lab research in your clan dojo, 5,000 credits

Build a stock the night before

Both blueprints yield five at a time and finish in one minute. Gather the materials before the event opens and you can run back to back without ever stopping to craft.

Eidolon Phylaxis (5): 500 credits · 15 Iradite · 20 Grokdrul · 10 Nistlepod
Infested Catalyst (5): 500 credits · 500 Plastids · 2,300 Ferrite · 1,800 Nano Spores

The materials are already on the Plains

Iradite and Grokdrul come from mining the Plains, Nistlepod from its plants. A mining run while you wait for the event beats interrupting a bounty chain later.

Bounty rewards

What drops when you finish. The rates below come from the official drop tables; because an item can appear in more than one stage, we list its highest chance.

Gladiator Finesse Common %36.91
Augur Message Uncommon %25
300 Endo Uncommon %25
100X Kuva Uncommon %23.86
Cetus Wisp Faster than picking them off the Plains one by one. Uncommon %16.11
Vigilante Pursuit Uncommon %16.11
Revenant Chassis Blueprint You can finish Revenant during this event. Uncommon %16.11
Naramon Lens Uncommon %14.77

Twenty-six relics are in the pool as well: 7 Lith, 6 Meso, 7 Neo, 6 Axi. Individually they sit between 0.67% and 1.14%, so nobody runs this for relics — they are a bonus when they land.

Standing earned

This is the standing you spend at Nakak. Stage by stage:

Tier	Stage 1	Stage 2	Stage 3	Stage 4	Drone bonus	Total
Plague Star	50	300	100	575	+25	1,025
Advanced	200	1,000	300	1,700	+75	3,200
Steel Path	200	1,100	400	2,100	+100	3,800

The drone bonus is only paid if the drone stays above 80% health — the one real extra on the run. Totals exclude the bonus.

Nakak offerings

38 items at Nakak in Cetus, unlocking as you run the tiers. Every price is two currencies: standing credits

New in 2026

Umbra Forma (pre-built) — one per event
Two-Handed Nikana Maligna Skin
Teralyst Prominence Sigil
Ostron Community Sigil
Rift Sigil

The official announcement does not list prices; they will show up at Nakak once the event opens. The Umbra Forma is the valuable one here — on its own it is reason enough to run the event.

Rank 0 Neutral 17

Fosfor Blau 250 500
Fosfor Rahd 250 500
Plague Star Emblem 500 1,000
Hemocyte Sigil 500 1,000
Hemocyte Glyph 500 1,000
Cetus Wisp 750 1,500 Faster than picking them off the Plains one by one.
Radian Sentirum 750 1,500
Heart Nyth 750 1,500
Murkray Liver 750 1,500
Norg Brain 750 1,500
Cuthol Tendrils 750 1,500
Murex Console 750 1,500
Earth Console 750 1,500
Hemocyte Floof 1,000 3,500
Fulmination 1,500 3,500
Sacrifice 1,500 3,500
Forma 3,000 5,000 Comes pre-built; where your surplus standing goes.

Rank 1 Collaborator 4

Eidolon Phylaxis 2,000 4,000 The consumable that unlocks the advanced tier. Buy it first.
Snipetron 3,000 5,000
Ether Daggers 3,000 5,000
Aspirus Ephemera 3,000 5,000

Rank 2 Defender 3

Aspirus Emergent Ephemera 4,000 8,000
Exodia Contagion 5,000 1,500 Throws your melee while airborne. No other source outside this event.
Exodia Epidemic 5,000 1,500 Contagion’s area-damage sibling.

Rank 3 Champion 14

Plague Keewar 2,000 3,500 Zaw tip. High status chance, the most wanted piece of the set.
Plague Kripath 2,000 3,500 Zaw tip. Puncture-weighted, for crit-focused builds.
Plague Akwin 2,000 3,500
Plague Bokwin 2,000 3,500
Butcher’s Revelry 3,000 3,500
Protosomid Shoulder Guard 3,000 5,000
Ghoulsaw 4,000 1,500 The main blueprint; four parts sold separately, 20,000 standing in total.
Ghoulsaw Blade 4,000 3,500
Ghoulsaw Chassis 4,000 3,500
Ghoulsaw Engine 4,000 3,500
Ghoulsaw Grip 4,000 3,500
Omni Forma · max 1 5,000 10,000 Comes pre-built. One per event.
Aspirus Apex Ephemera 5,000 10,000
Cryptanaut Necramech Helmet 5,000 10,000

Efficiency notes

A full squad is what makes a chain run work: if all four carry a Phylaxis and a Catalyst, the advanced tier opens back to back with no waiting.
Instead of everyone taking bounties from Konzu one at a time, have one person keep restarting it — that way you never fly back to Cetus.
The drone stage is the longest and most fragile part of the run, and it is also where the bonus comes from. If you want to go faster, go faster there.
Standing is capped daily. When you get close to the cap, stopping and saving the rest for tomorrow beats running for nothing.
Steel Path pays more standing, but its Hemocytes come in at level 198 and up; if the squad is not ready for that, the advanced tier is the more efficient choice.