Ionite Fever



"Ionite Fever" is a special event that debuted in February 2020, and running for 20 days. In it, you can fight in a special event campaign in normal mode (unlike other special events, there is no heroic mode). For the official details, you can see the official post.

The event re-opened January 15, 2021, with an expanded shop. There were some issues with the units from the Lairs on release, but these are now fixed. The shop prices were adjusted January 20. In the initial release of the event, it was called "Ionite Pyrexia", but the 2021 release updated it to "Ionite Fever". The difficulty of some levels was also adjusted relative to the 2020 version.

In 2022, the event was again available from January 24 to February 9, 2022. There were no changes from the 2021 version; however, enemy Psionics do not seem to be functioning correctly, which makes many maps significantly easier.

Campaign


The campaign contains a total of 20 areas, organized into 5 branches originating from the area in the bottom right. The first area, in the bottom right, can be unlocked for free. The rest of the areas must be unlocked by using event resources: either raw ionite ore (for the four side branches) or shabby maps (for the central branch). You can unlock the areas in any order. Once you win a fight in an area, that area will go on cooldown for a length of time. The resources required to unlock an area, as well as that area's cooldown timer, increase as you move deeper into the campaign map. With the exception of the last map, you win in the normal way, either by capturing the enemy spawn point or destroying all units. On the last map in the center branch, there is a boss with 600,000 HP that must be destroyed. It is similar to a convoy boss, but unlike convoy bosses, this one does not attack.

Note that in the table below, the enemy levels listed contain two parts: the first number or range is for units spawned from the enemy spawn point, and the second number is for units spawned from enemy lairs. For more information see the detailed level information section below. Most levels also have a standard troop loadout of 5I, 5St, 2HI, 1Sp, 2V, with a few exceptions: Note that for the last three, the loadout is large enough that it extends onto a second page -- make sure that you check this so that you don't end up using autofilled units you didn't mean to use! In "Scientific secrets", you must also take a minimum of 10 units (like a convoy battle).
 * "Snoridge" Mine is 5I, 4St, 2HI, 1Sp, 1V
 * Altar of Science is 7I, 6St, 3HI, 1Sp, 2V
 * The echo of the past is 7I, 6St, 3HI, 2Sp, 1V
 * Scientific secrets is 7I, 7St, 3HI, 2Sp, 2V

Event resources
There are five different resources that can be obtained during the course of the event.

Raw ionite ore is given as a reward for winning battles on the four side branches. It is used to unlock maps on the four side branches, and to purchase some items from the event shop. Areas that are unlocked with raw ionite ore can also be unlocked with gold at a rate of 25 gold per raw ionite ore. At the shop, you can exchange 10 raw ionite ore for 1 purified ionite. Shabby maps are given as a reward for winning battles on the end areas of the four side branches. They are used to unlock maps on the central branch, as well as to run the last two maps on the central branch. In the initial release, they were also required to unlock some items in the shop, but this was removed in the 2021 update. Areas that are unlocked with shabby maps can also be unlocked with gold at a rate of 250 gold per shabby map. Alternatively, shabby maps can be purchased from the event shop for either 5x isolated infected ionite or 100 gold. Purified ionite is given as a reward for winning battles on the central branch. It is used to purchase higher-level items from the event shop. Purified ionite can also be purchased from the event shop for 10x raw ionite ore, or conversely used to purchase isolated infected ionite. Isolated infected ionite is given as a resource for winning the last three battles on the central branch. It is used to purchase items from the event shop. Isolated infected ionite can also be purchased from the event shop for 10x purified ionite, and 5 isolated infected ionite can be traded for a shabby map. Ionite Trophies determine your final rating in the event. When you win a battle, you get one trophy for each enemy unit and building killed. At the end of the event, you receive additional rewards depending on your total rating accumulated.

Enemy units and buildings
There are four enemy units that you will face:
 * Enslaved miners are the enemy infantry unit. They appear in groups of 6, and can very quickly swarm your position. Because they are melee fighters, they can easily capture your spawn point if it is not well defended. At higher levels they have substantial evasion, making them quite difficult to quickly take down.
 * Resurrected miners are the enemy stormtroopers. They are not quite as fast as the enslaved minors, and only appear in groups of 3, making them somewhat less of a threat.
 * Juggernauts are the enemy heavy infantry. They are slow and only appear singly, so they are not too dangerous as an offensive unit, but their ability to absorb large amounts of damage makes them very effective as a screen for more dangerous units.
 * Psionics are the enemy special unit. They use psionic ability to attack, producing an effect similar to a discharge. At lower levels they are not too dangerous, but at higher levels they become extremely deadly, as their damage is high enough that they can easily incinerate an entire squad of your infantry or stormtroopers in a single shot.

In addition, there are three special enemy buildings that will appear on most maps:


 * Lairs summon enemy troops approximately every 11 seconds. The troops summoned are randomly selected from the four types available. The level of the troops summoned is equal to the level of the lair. All lairs on the map are synchronized and will summon troops at the same time. The event maps are designed to use lairs to either overwhelm you with weaker versions of the normal troops or to quickly capture your spawn point.
 * Psionic beacons cast fear on all nearby units every 16-18 seconds. This effect is the same produced by the "Lord of the lands" Berserk skin or Esben Defender in his transformed form. While afraid, your units will usually run backwards towards your spawn, but occasionally sometimes run deeper into the level. As psionic beacons effectively push your army back, the event maps are designed to use this effect to clump your units together (to make you vulnerable to the psionic unit's discharge attack) or to protect other event buildings when they're placed nearby. Psionic beacons do not have any level.
 * Enslavers take control of one nearby squad, similarly to the effect of Betrayal, every 20 seconds. This causes the affected unit to act like an enemy; they will run towards your spawn and will target your units. Your other units will target the affected units and try to kill them. The effect wears off after 7 seconds. The Enslaver can target units slightly further away than the Infantryman default range. Long-range units are recommended to safely destroy the Enslaver. Enslavers always seem to have level 1.

Event shop
The items available in the shop are as follows. In the initial 2020 release of the event, shabby maps were required to unlock many of the more powerful store items, but this was thankfully removed in the 2021 appearance.

End of event rewards
Rewards are given at the end of the event based on your total accumulated rating. Your rewards increase gradually with each level of rating points you achieve, with higher rewards being unlocked starting at higher levels of rating.

The rewards are:
 * Res.: the specified quantity of each basic resource (////)
 * Man.: the specified quantity of each type of manual (health/damage/accuracy/evasion/armor/skill)
 * Units: the specified quantity of each of Elite Enslaved miner, Elite Resurrected miner, Elite Juggernaut, Elite Psionic
 * SP: spare parts
 * SRK: the first column is the specified quantity of SRK Mk.I, SRK Mk.II, and SRK Mk.III, and the second column is the specified quantity of SRK Mk.IV and SRK Mk.V
 * MRK: as above, for MRKs
 * UIC: unstable ionite cores
 * Mod: ordinary equipment modifier modules

Detailed map information
In all the listings below, the "enemy units" lists the troops that emerge from the enemy spawn point, not including troops that the Lairs in the level may create. Note that with the exception of the last level, there are no strategic points in any of the missions.