(This is my first attempt at writing HFY, I hope you guys enjoy it)

The k'tarr representative raised their voice over the hum of chattering dignitaries "Attention every, may I have your attention please! I understand we are all concerned but if we are to find a solution we must have order."
As the chattering of dignitaries subsided they continued "As you all know we are gathered here today to discuss the ongoing attack by hostile species fourteen..."
"What do we even know about species fourteen?"
"Would the tyrl representative please allow me to finish before speaking. It is indeed true that we know almost nothing of species fourteen itself, other than that which we have been able to discern from the construction of the catalyst weapons used against our worlds."
Catalyst weapons; the words sent a murmur through the arrayed representatives while the photocommunicators flashed with alarmed reds and sorrowful blues. Seated at the head of the assembly, the races of the afflicted worlds reacted with mixed stowicism, anger, and deep saddness.
Struggling to maintain composure the k'tarr representative continued "I will now scede the floor to the honorable prince sheltaf of the mycorian republic who may be able to grant us further insight on the nature of species fourteen."

Hobbling and assisted by a ceremonial bodyguard, sheltaf radix, third prince of the mycorian republic, ascended to the podium soft lines of pained yellow flashing along his side with each step. "I'm sure none of you here today know me, as a mere third prince my role in political affairs was minor. I do believe however that all of you knew my older sister the honorable diplomat rhelsha; it is my deepest regret to bring you news of her death, as well as that of the second and fourth princes, and my parents."
Solemnity at once took the crowd as the last whispers and feint flashes died away.
"As the eldest surviving member of the radix family it is my responsibility to take on her role as representative to the council, and to tell you how she died."

"As many of you know our capital world was the first hit by the catalyst, though the exact events are murky and reconstruction is ongoing I believe we are now able to provide the council with an aproximate series of events."
Behind him the council chambers screen lit up to display a diagram of a long elipsoid object reminiscent of a torpedo. "On the date of approximately 14/09/2358 [translated for readability] standard galactic time this object is believed to have been picked up by sensors entering the secure space around the capital world shala. At the time the object was dismissed as debris and recieved no further attention beyond the standard logging of such objects."

The screen changed to display a real image of the same object, this time inside a biohazard containment chamber and bearing dents and scorching from re-entry.
"It was not until the object subtly shifted orbit at the last minute and entered into a re-entry trajectory that the alarm was rasied, unfortunately for all of us it was already too late. Immediately preceeding and for some time post impact the object began dispersing a cocktail of various previously unknown micro-organisms, fungal spores, and seeds; the first response team on site had their respiratory systems completely overwhelmed within minutes."
The screen changed once more, revealing an image of shala from low orbit, Even from orbit a pale green scar could be seen originating from the impact point, overtaking the pastel blue of the worlds native flora. "Before we knew what was heppening the foreign organism began overtaking our natural environment at an alarming rate, our forrests were broken down into slurry by alien bacteria, the air became choked with deadly spores and the most unfortunate were directly parisatized and consumed by aggressive flora; my sister..."

As the last prince of shala lapsed into silence representative k'tarr resumed the podium and glanced at the head of the assembly. "I'm sure many of you have similar stories to share, at present twenty one worlds have been overrun by the catalyst bioweapon and trillions have died."
There was a commotion among the assembled delegates as the lanian representative broke down and had to be removed from the assembly.
"Thanks to the bravery and sacrifice of mycorian scientists, and many others from all over the union we do now have at least some information about species fourteen. Reverse engineering of the catalyst weapons themselves suggests their spaceflight is surprisingly crude as each one utilizes only the most basic and inneficient of blink drives, analysis of the alloys used suggests they were manufactured under a lower gravity than is standard for habitable worlds. Finally sequenceing of the genomes of some of the bioweapon strains shows they share a common base, though we cannot expect species fourteens natural ecology to be remotely similar to that of their bioweapons our scientists believe we can still uncover valuble information about their metabolisms and the likely atmospheric composition of their homeworld."

The council chamber erupted in speculation as delegates considered the potential implications of such information and argued about how it should be used. As the chatter grew into a roar the delegate k'tarr once again had to raise their voice. "I'm sure you all have questions, even demands; before then I have one simple proposition. Scientsits from the mycorian republic working with the countil believe they have pinpointed the aproximate location of species fourteens homeworld. My government proposes a resolution to launch a covert expedition to this world in order to gather more information about our enemy in advance of a counterattack. If there are no objections to this proposal would the esteemed representatives please now cast their votes.