"Every galaxy has its own pinnacle of weirdness. For Akradax, the pinnacle is Cireasei. That's why we're going there to learn more about this local oddity." - Bilmir Serdousa, who came up with the concept of Operation Abuna.
Cireasei is an anomalous substellar object located in the Snow Globe Nebula in the Akradax Galaxy. It is most famously known for two violent and bright eruptions which occured during the Akradax Faction Period
Cireasei was born around 150 million years ago as a seemingly ordinary brown dwarf, likely a class L brown dwarf at the time of its eruption. Cireasei was created with perhaps 5-6 planets, but it is almost impossible to tell due to their disappearance (Likely attributed to past explosions). It was likely part of the Snow Globe Nebula at the time of its formation.
It was discovered by the SGNM-SEC (Snow Globe Nebula Mapping & Survey Exploration Committee) in 45488 BCE, thus giving it the alternate designation SGNM-SEC J051058.48-434628.21 (Shortened to SGC-J051043). Cireasei was documented as a possible brown dwarf. Its planetary system was also thoroughly searched, giving Cireasei four minor and desertic planets.
Resulting from the immense amount of objects catalogued by SGNM-SEC, surveyors soon moved continued onto the deep Snow Globe core. However, this would be uprooted as remaining surveying teams in the outer reaches of the nebula later discovered something much more anomalous under Cireasei's surface.
In 39526 BCE, a bright flash was observed from the location of Cireasei. It was observable mainly in infrared and visible light, but some radiation was also emitted in other wavelengths. Upon closer analysis, it was revealed that one of the Akradax Factions had sent an object crashing into Cireasei. In response to the collision, Cireasei expanded to around 250 stellar radii, and flared up to nearly 150000000 Kelvin in temperature. It also insanely increased in luminosity, briefly outshining every galaxy in the local universe, quickly vaporizing any planets that might have been there and triggering the destruction of all but one of the Akradax Factions.
This brightness lasted only minutes, as it rapidly dimmed. A few hours after the bright flash, the remaining part of Cireasei (which was still intact) slowly fell in on itself. A month after the eruption, Cireasei was only about 1/10 the size of the sun, and cooled to around a mK. The superheated cloud of gas that Cireasei had generated slowly dissipated and became undetectable after ~2.8 years.
It was at this time when matters became even more confusing. Scientists from the remaining faction observed that it contained a substantial amount of metals, which comprised about 79% of its bulk. They also noticed that it had lost most of its mass, going from 62 Jupiter masses to 27 Jupiter masses. For around five years, Cireasei stayed at that stage, being around 1000 times brighter than the sun. It acted similar to a WR-Class star, losing quite some mass (~4 Jupiter masses). In 99560 CE, Cireasei erupted again.
Cireasei erupted for a second time, losing 0.002 Stellar Masses in the process. The second explosion was more like a tiny type Ia supernova, as another object, probably a small planetoid, crashed into the star. The eruption made it lose around 95% of its remaining hydrogen. It also shrank Cireasei fourfold and decreased its temperature to a measly 1153.5 K. At this point, the scientists studying it decided to give it a name, so they called it Cireasei. They also released their findings in a paper, which got galaxy-wide attention. This attention was because up to then, the eruptions were associated with an urban legend, as the Faction Period had been all but forgotten.
Currently, Cireasei is a small 'frozen star,' a rare kind of star very rich in metals. It is one of only four found in Akradax, and also the least massive and the hottest. It also has a small accretion disk made up of comets that lost their orbits during Cireasei's first eruption, due to being slowed down by the large expanding cloud of gas Cireasei emitted during the first eruption.
Due to the asteroid an Akradax Faction (its still unknown which one) jettisoned into Cireasei being rich in many rare elements, Cireasei has an overabundance of lanthanides and actinides. These make up about 3% of Cireasei's composition, giving its spectrum a clear signature of these metals.
What actually happened
A study from 99945 CE appears to finally settle the arguments over what really happened with Cireasei. The study suggests that Cireasei in fact underwent a long helium flash. This means that when Cireasei collided with the missile, the collision speed forced Cireasei's core to heat up to the extent that it briefly started to fuse helium. The entire star heated up to hundreds of mK and immediately vapourised all planets in the immediate vicinity of it. As a result of it being so hot, it basically exploded, ballooning from around 75,000 km in radius to over 150 million km in radius. This resulted in it brightening in over 65 magnitudes, sterilising nearby star systems (all life that once existed in a ~1000 light year radius is now gone), and wiping out all but one of the Akradax Factions, bringing the Faction Period to an end.
Soon the fusion stopped, and it fell on itself. The cloud of superheated plasma travelled away from the shrinking Cireasei, and faded away in a couple of years. The second eruption was caused by the same mechanism, but significantly less powerful as well as being on accident, as the object was only an asteroid-sized object. Significant safety measures are now present in the vicinity of the anomalous star to prevent anymore eruptions.