Translucence

This spell is a part of the Air's Constant Flow spell chain and can be found in the Air's Constant Flow rune stone.

Aeromancers are aeromancers because of their connection to the element of air itself, and air is something that is more often than not felt, not seen. This is something the aeromancer has always known instinctively, from even a very young age when they marveled at how something invisible like the wind could move things, even when they began to use the same wind themself to blow about fallen leaves or propel them forward at faster speeds. The one trick that first brought fear to the aeromancer before it brought them joy was when they watched their hands seemingly vanish, as if they were becoming like the air itself. Now that the aeromancer is older and more skilled, they have learned how to tap into the runic power within their runic soul - the West Wind - and become like the wind itself. To become translucent.

The change isn't invisibility - anyone looking hard enough can still find the shape of the aeromancer standing there. What gives is everything around that shape: edges blur into whatever's behind them, color and outline thin toward the same soft transparency the open sky has, and the eye simply struggles to hold onto something that no longer insists very hard on being there. It fools sight alone - footsteps sound the same as ever, scent carries just as far, and no ward or magical sense so much as flickers - but sight is what most creatures reach for first, and sight is exactly what gives out. Making the target out at all takes a Hard Perceive check, harder still with distance (-2 for every space, 3 feet, between watcher and target) and harder again in the dark (-5 additional), where a shape this thin has nothing left to catch what little light remains.

The translucency isn't permanent. The aeromancer finds this out sooner than later. After some time (1d10 hours) the West Wind's power fades and retreats back within their runic soul and the aeromancer becomes fully visible once again. This suits the aeromancer just fine - through the spell they have eluded capture and perhaps even created some fun mischief, but they never wanted to be translucent forever. Where's the fun in that?