freyar
Extradimensional Explorer
Sure. Based on your reasoning, though, I'd like to say they can take damage if they're unconscious (though I'm also willing to leave it more vague as follows). And let's make the stunning random. How about this?
Controlled Falls (Ex): A falling drop spider (which is not entangled or immobilized) can deploy a mesh between its legs to guide its descent. A parascending drop spider can move 5ft sideways for every 10 feet it falls. Further, due to unique leg structure, a drop spider never takes damage from falls. However, a drop spider must make a Fortitude save (DC = 1 per 10 ft fallen) or be stunned for 1d3 rounds as it recovers its equilibrium.
Controlled Falls (Ex): A falling drop spider (which is not entangled or immobilized) can deploy a mesh between its legs to guide its descent. A parascending drop spider can move 5ft sideways for every 10 feet it falls. Further, due to unique leg structure, a drop spider never takes damage from falls. However, a drop spider must make a Fortitude save (DC = 1 per 10 ft fallen) or be stunned for 1d3 rounds as it recovers its equilibrium.