So I had another thought while watching a playthrough of the Bird Boss. I felt the first giant was a little more inspired in its simplicity than this one which resembled its SOC counterpart a little too much (although the fireballs were amazing). I think with a few tweaks and better integration with the grappling hook, this could be an awesome boss. So first things first, I feel the introduction of the grappling hook was done way too early and didn't feel impactful. Same goes for the gliding cloth. I like when a game introduces a new mechanic, then forces me to use that mechanic for the next section of the game with an increasing level of difficulty (think of Bash during the Ginso level in Ori and the Blind Forest). I think a great way to test a players mastery of the new mechanic in PFTG would be via a giant battle. To honest, you did this already with the first boss and the climbing/grip mechanic, but let's expand this philosophy to the grappling hook and Bird Boss. For example, reward the player with the grappling hook after the first boss is defeated. Make the first boss arena is inescapable without the grappling hook, forcing the player to immediately use and comprehend the new mechanic. Then increase the complexity by adding light puzzling to the grappling hook, then combat. Make it in a way that the player can still succeed if they don't use the hook, but rather they will have a significant advantage if they do. Ramp this up by combining this is pre-existing mechanics and finally, have it culminate in a boss battle. Now here's where the Ballista comes in. Have the Bird Boss arena as a circle surrounded by 4 obvious "gong pistons" (my name for the glowing things you push). Each one powers up an ancient piece of machinery encrusted under the ice (maybe 2 to lift it into position and another two to spin sparking generators to build up a charge). Once all four gong pistons have been activated, the player will see a clear slot to insert their grappling hook in a central position. Not sure if the player should target the swooping bird or if the aim should be automatic via cutscene but essentially the giant ballista should hit the bird and ground it, allowing the player to push the only gong piston on the birds head and defeat it. If the player takes too long, the bird free's itself and the 2 generator gongs have to be reset to recharge the ballista. I know its a little long winded and to be honest the gliding cloth might be a better mechanical fit for Bird Boss. However, I definitely there's a way where PFTG's unique mechanics can be more versatile and exciting if each one is paired with a boss.