Scorchling! It has a chance to drop from a 70+ boss known as Ahune. Much like the Headless Horseman, Ahune can be summoned in a dungeon (The Slave Pens in this case) via a daily quest which is only available for 15 days each year. Considering how difficult the Sinister Squashling was for collectors to farm, this fella could be very rare indeed.
Additionally, the quest that rewarded the Spirit of Summer is no longer available. However, the pet may now be purchased for 350 Burning Blossoms—a currency which is available via quests throughout the 15 day event.
Midsummer Fire Festival Preview
February 22, 2008