You know what ancient fiends of air eat for breakfast? Elves. It's recommended that Tiamats get at least three young, nubile elves per day to maintain a proper dietary balance. While Jerin's a bit on the scrawny side, all things considered, she'll make a tasty enough morsel here as a warmup. Tiamat's breath attacks will poison, freeze, and burn the half elf, letting Tiamat work her deadly magic. Chaos's will must be inflicted on the lower divisions this season, and the fiend of air is more than willing to do this for her master. Starting the festivities by sending a goodie goodie like Jerin to a ruinous defeat is the perfect start of the reign of terror for the Final Fantasy fiend force!
