Expulsion Snare
You conceal a rounded board or thin metal plate just beneath the ground, concave side down. The first creature to enter the snare's square finds it unexpectedly springy and is bounced back out of the square when the flattened board springs back into place. The triggering creature must succeed at a DC 17 fortitude saving throw or be moved into an adjacent square (chosen by you when you craft the snare). This is forced movement. On a critical failure, the creature falls Prone in that square.
Traits
An item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
A hazard with this trait is a constructed physical object.
Traps typically made by rangers, snares follow special rules that allow them to be constructed quickly and used on the battlefield.
A hazard or item with this trait is constructed to hinder interlopers.