Tides of Tomorrow Plastemia Guide

1. What Is Plastemia?

Plastemia is the central disease mechanic in Tides of Tomorrow — a fictional illness caused by centuries of microplastic pollution on the ocean planet Elynd. Microplastics have saturated Elynd's atmosphere, water supply, and food chain to such a degree that prolonged exposure causes living organisms to undergo a cellular transformation: their organic matter is gradually replaced by polymers, effectively converting them to plastic from the inside out.

In gameplay terms, Plastemia functions as a slow-burning survival threat and narrative driver. Your character, the Tidewalker, is not immune — they begin the game with a low baseline Plastemia exposure and must manage it throughout all three acts. Unlike most survival games, Plastemia is not a resource you constantly top off: it is a background pressure that becomes acute only when you enter contaminated zones, make certain poor choices, or run out of medicine for extended periods.

The disease also has profound world-building implications. Many NPCs across Elynd are in various stages of Plastemia progression — some showing early signs (stiff joints, discoloured skin), others significantly advanced. Your ability to help them (or your choice not to) is a core moral dimension of the game and ties directly into faction reputation systems.

2. The Plastemia Meter — How It Works

Your Plastemia Meter is visible in the top-left HUD at all times. It is a 0–100 scale with three threshold zones:

• 0–49 (Green Zone — Managed): Normal gameplay. No mechanical penalties. Focus on keeping medicine stocked and avoiding unnecessary contaminated zone exploration.
• 50–74 (Amber Zone — Elevated): Dialogue options marked with faint discomfort animations. Some NPCs react to visible early-stage symptoms. Certain strenuous physical sequences (climbing, swimming) take longer. Start using medicine aggressively.
• 75–99 (Red Zone — Advanced): Significant movement slowdown. Several dialogue options become unavailable (NPCs don't trust visibly sick strangers). The Plastemia fog visual effect intensifies. Some quest givers will refuse to interact until you treat yourself. Use all available medicine immediately.
• 100 (Critical State — Emergency): Full Critical State. Triggers in Act 3 if untreated for 24 in-game hours leads to the Plastemia Ending. All non-faction NPCs refuse interaction. A special emergency dialogue unlocks with all faction leaders offering treatment (at heavy reputation costs).

What Raises Your Plastemia Meter

• ⬆️ Passive ambient increase: ~1 point per in-game hour (always active)
• ⬆️ Entering Yellow Fog zones: +3–8 points per minute depending on fog density
• ⬆️ Eating contaminated food (some forage items are tainted): +5–15 points
• ⬆️ Swimming in polluted open ocean: +4 points per minute
• ⬆️ Failing to sleep/rest for extended in-game periods: +2 points per missed rest
• ⬆️ Certain Marauder questline activities (handling toxic cargo): +10 points fixed

What Lowers Your Plastemia Meter

• ⬇️ Medicine (Small): -15 points
• ⬇️ Medicine (Large): -35 points
• ⬇️ Reclaimer Medical Treatment (faction service): -40 points, costs 2 Rations
• ⬇️ Mystic Ritual Cleansing (Act 2+): -50 points, requires Mystic rep ≥30
• ⬇️ Sleeping in a Clean Shelter (non-contaminated zone): -5 points per rest
• ⬇️ The Field Medic trait: Reduces ambient increase rate by 50%

3. Infected Zone Guide

Tides of Tomorrow's world is divided into Clean Zones, Amber Zones (moderate contamination), and Yellow Fog Zones (severe contamination). The zone classification of each area can also be altered by your Story-Link partner's history — Marauder-aligned partners tend to generate more Yellow Fog expansion through industrial activity.

4. All Medicine Locations by Act

Act 1 — Driftholm & East Reach

• 🏥 Driftholm Pharmacy Ruins (east side, ground floor) — 2× Small Medicine
• ⛵ Sunken Boat Dock (underwater storage crate) — 1× Small Medicine
• ⛺ Reclaimer Storage Tent (Eyla's camp, free with rep ≥20) — 1× Large Medicine
• 🏪 NPC Trader Maris (Driftholm marketplace, costs 4 Rations) — 2× Small Medicine
• 🔒 Locked Medical Cabinet (Marauder checkpoint, requires Stealth or Marauder rep ≥30) — 1× Large Medicine

Act 2 — Marketland & Surrounds

• 💊 Marketland Medical Vendor (unlimited stock, costs Silver Tokens) — Small and Large Medicine available
• 🏥 Reclaimer Medical Bay (service, costs 2 Rations per treatment) — -40 meter reduction
• 🔮 Mystic Ritual Cleansing (Mystic rep ≥30 required) — -50 meter reduction, free
• 📦 Abandoned Supply Depot (northeast island, unmarked) — 3× Small Medicine, 1× Large Medicine
• 🎁 Eyla Quest Reward (completing The Children of Driftholm) — 2× Large Medicine

Act 3 — Apex Platform & Final Areas

• 💊 Apex Medical Centre (always stocked) — unlimited Small Medicine for Silver Tokens
• ⚔️ Obin Emergency Treatment (Critical State trigger, Marauder rep ≥40) — Full cure, costs -20 Reclaimer rep
• 🌟 Mystic Final Cleansing (True Ending path, Mystic rep ≥70) — Full cure, no cost

5. Faction Cure Questlines

Each faction has a questline related to Plastemia treatment and ultimately to a cure. These questlines are not fully separate — they converge in Act 3 at the Council Vote.

⚔️ Marauder Cure Path — "The Iron Antidote"

Obin has access to a Plastemia treatment serum developed in secret by Marauder scientists. Completing The Enforcement Run and The Cache Seizure grants access to the serum, which reduces meter by 60 points and prevents Critical State. However, the serum is addictive — once used, your meter begins rising faster (+50% ambient rate) unless you continue receiving Marauder treatments. This is the game's commentary on dependency-based medicine systems.

🤝 Reclaimer Cure Path — "The Filter Accord"

Eyla's faction pursues atmospheric filtration rather than direct treatment — reducing Plastemia meter gain rates across all zones globally rather than curing individuals. Completing The Filtration Accord quest reduces all zone Plastemia rates by 30% permanently. This is the most sustainable solution in the game and the best choice for long-term meter management in Act 3.

🔮 Mystic Cure Path — "The Tide Turns" (True Ending)

The Mystics' approach is the only actual cure — not a treatment but a fundamental solution that the True Ending resolves. See the True Ending section for full details.

6. Trait-Based Plastemia Mitigation

• 🧪 Field Medic (Starting Trait) — Halves ambient meter increase rate. In Yellow Fog zones, reduces meter gain from +6/min to +3/min. The single most impactful survival trait in the game.
• 🗺️ Navigator (Starting Trait) — Unlocks water routes that bypass the most contaminated ocean crossings, reducing exposure during travel by up to 70%.
• ⚡ Scavenger (Starting Trait) — +25% medicine quantity from all loot caches. Indirectly the most powerful for meter management if you explore thoroughly.

7. Surviving Critical State (100% Meter)

If your meter reaches 100%, you enter Critical State. This is not an instant game over — you have a window to act. Here is the priority sequence:

1. Immediately open your Journal and check which faction leader is nearest. All three faction leaders offer emergency treatment in Critical State.
2. Obin's Emergency Treatment (Marauder) — Fastest to access in Act 2 and 3. Costs -20 Reclaimer reputation. Does not require prior Marauder rep.
3. Eyla's Medical Bay (Reclaimer) — Requires reaching her camp (may be a distance away). Costs 4 Rations. No reputation penalty.
4. Voot's Ritual (Mystic) — Only available if Mystic rep ≥30. Free, but requires reaching the Mystic Sanctuary.
5. If no faction leader is reachable within the time limit, use any medicine items in your inventory. Even Small Medicine (-15 points) drops you out of Critical State.

8. Plastemia FAQ