The Ant Crisis refers to a series of ant infestations in the areas around the walls of Marali, in the year of 449. According to the Myrmecologist Society of Lerilin, those were likely due to the ant mating season.
The ant frenzy was eventually controlled by a discreet dose of poison administered by the wizard Ryen. However, the situation had already caused a diplomatic incident between the city and the scholars from Lerilin.
During the infestations, the ants had been digging channels for their nuptial channels. These channels, quite large in size, though smaller to the ant caves of Lerilin, were used by the leanest and tiniest element of the Creed to infiltrate the Marali and kidnap Commander McTyr.