A limit order is executed at a predetermined price set by the user. It will have margin trading facilitated decentralized open orderbook. Limit orders will boost market activity and cater the arbitragers.
Limit orders on Ariel would be executed by the Filler Bots. As Filler Bots pay the transaction gas fee, the transaction is gasless for the traders. These bots will only execute a transaction if it is profitable for them.