The Wither
The Wither was an event of broad sickness that affected Pella in forests of Imperia. It was unknown whether it affected other races and to what degree but it brought devastating long-term sickness along majority of Pella, severely reducing their strength and capability to survive. Rough winters did not help Pella as winter by winter their numbers have shrunk by the sickness that spread among them. Pella named the sickness Withering as it lead to major weakening of one's mind and body for a very long time that could spread out even for years. This sickness, combined with Pella's pride and lack of openness to others lead to near extinction of the race that was only saved by nearby humans who saw a possible mutual profit in trading with them.