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Thermia Fractures is a recurring world state event which occurs once every few weeks at Orb Vallis, Venus. During the event, the landscape would be littered with thermia fractures which a player can seal for rewards.
To begin sealing Thermia fractures, players must first look for a Coolant Canister, and at least one canister is required to seal one. Coolant Canisters can be found by defeating any Coolant Raknoid which usually follows the Exploiter Orb around, and the Exploiter Orb herself can be found patrolling around the Temple of Profit in Orb Vallis.
After the Coolant Canister is acquired, the players must then look for Thermia Fractures, which are scattered across the Vallis and can be easily identified from afar as a fissure constantly erupting with (orange) Thermia.
Sealing can be initiated by "interacting" the fracture with a Coolant Canister, which will in turn initiate a Mobile Defense-like objective where players defend the canister from attacking Corpus troops. Sealing a fracture takes 3 minutes to complete, though instead of showing the time the UI will display a counter up to 100. Each fracture closed will award 1 point to the player's overall score, and a quarter of the normally blue canister will turn orange. Closing 4 fractures with the same Coolant Canister will award 1 unit of Diluted Thermia and an additional 3 points, for a total of 7 points.
Players can speed up acquiring Diluted Thermia and points by feeding up to three additional Coolant Canisters within the first 30 seconds of sealing the fracture. Each canister consumed increases the sealing process by 50 seconds (or an additional 25 units to the counter, up to 175 units/5.5 minutes if four canisters are used). Adding additional canisters also increases the initial Alert level during the sealing process and increases the frequency of a "Burp", which further increases the difficulty of defending the canister. Below is a list of potential Burps and their effects;
|Enemy Level Burp||Increases the current Enemy Level.|
|Eximus Burp||Spawns additional Eximus units.|
|Nullifier Burp||Briefly spawns a Nullifier bubble around the fracture.|
|Radiation Status Effect Burp||A sudden yet brief burst of Radiation damage, with a guaranteed proc.|
|Rage Burp||Increases the damage output of nearby enemies.|
|Thermic Raknoid Burp||Spawns Thermic Raknoids, which resemble Mite Raknoids and deal Heat damage with their attacks, but are otherwise identical behaviorwise.|
Note that it is also possible to mix canisters with differing levels of Thermia. For example, two canisters can be inserted into one fracture to create one half-full canister, and then used on another fracture with an empty canister to yield a full canister of Diluted Thermia and 7 points.
The points that players gather from sealing fractures accumulate across multiple instances of Thermia Fractures, which means that any points that the players had accumulated in one instance of Thermia Fractures will be carried over to future instances. Below is a list of rewards and the minimum number of points required to get them.
- 5 Points: Operation Buried Debts Emblem
- 25 Points: Amalgam Shotgun Spazz and Amalgam Serration
- 50 Points: Amalgam Barrel Diffusion and Amalgam Organ Shatter
- 75 Points: Operation Buried Debts Sigil
- 100 Points: Opticor Vandal (Includes weapon slot and pre-installed Orokin Catalyst)
Lastly, the Diluted Thermia collected from fractures can be used to summon and fight the Exploiter Orb by interacting with the Thermic Condenser located at the far end of Deck 12. Note that the Exploiter Orb can be summoned whether or not an instance of Thermia Fractures is active, and is only limited by the amount of Diluted Thermia the player has on hand.
- Operation: Buried Debts, the event that introduced this world state.
- Operation: Plague Star, an earlier, semi-reoccurring event on the Plains of Eidolon.
- Ghoul Purge, a reoccurring world state event that also occurs on the Plains.