Hi guys. I just discovered the Wiki website for Spirit Island and it’s great!
Someone who entered the text on Ocean’s Hungry Grasp’s strategy page for the innate power “Pound Ships to Splinters” was questioning why it would require air to trigger. Waves are born from winds blowing on the surface of water. If you want to create big and strong waves to crash invaders’ ships, you need strong winds, thus the requirement for air element in the power’s thresholds.