Pinnacle

The spire’s pinnacle is flat and roughly 40 feet square. The edges are crumbling away; it wouldn’t be safe to stand too close to any of them. Vines and low brush grow in profusion. Bones and scraps of meat from dozens of creatures are scattered everywhere.
A crumbling stone tower rises another 30 feet above the northern corner of the platform. A roaring flame floats in the air, hovering above the tower. Tumbled debris from the tower is heaped around its foundation. Three humanoid creatures with needlelike beaks and leathery wings are worrying the last shreds of flesh from well-chewed bones near an open doorway into the base of the tower.

Firefinger’s pinnacle is 300 feet above ground. When the sky is clear, characters can see over 20 miles around the tower. More importantly, they can make out the scattered plateaus, the Peaks of Flame and other volcanoes and mountains ringing the southern coast, and the enormous gaps in the jungle canopy that mark the Aldani Basin, Lake Luo, and the Valley of Embers.
Pterafolk never use the chimney between level 3 and level 4 other than to occasionally drop food to a prisoner. The top of the chimney is surrounded by rocks and low bushes, providing enough concealment for three Medium creatures. Hiding from the pterafolk requires a successful DC 12 Dexterity (Stealth) check, with advantage at nighttime or when it’s raining.
Six pterafolk lair atop the tower, including the flock’s leader, Nrak, who has 40 hit points. Nrak is a hate-filled creature with a scar that begins at the top of its head and cuts down the right side of its face and chest to below its right wing.
If Azaka Stormfang is with the group, consider adding more pterafolk to the fight; she swings the balance heavily in favor of the attackers. Additional pterafolk circle high overhead and can join the fray at any time. Pterafolk won’t hesitate to shove a character who foolishly stands at the edge of the tower. They can jump from the tower, circle around on the wing, and use their dive attacks to great advantage.
Firefinger’s beacon is a magical plume of fire that puts out tremendous heat. Any creature that starts its turn within 10 feet of the flame takes 10 (3d6) fire damage. Any creature that enters the flame or starts its turn there takes 35 (10d6) fire damage. A successful dispel magic (DC 17) cast on the flame dispels it.

Treasure

Inside the tower are crude nests and four moldy wooden chests. The chests aren’t locked. All together, they hold 2,000 cp, 730 sp, four gemstones (50 gp each), and a spell scroll of commune with nature. One of the chests also contains a cloth-wrapped, wooden mask resembling a stylized tiger’s face. This is Azaka’s mask of the beast. If she’s with the characters, she claims it immediately.