It naturally has a slow, lasts for 6 seconds and can be enhanced with helixes. At level 1 you can get Waste makes Haste to grant movement speed to allies . At level 4 you can get either damage over time, or a larger AoE, the damage isn’t much but it can be enough to make enemies not want to go in it and can finish off escaping enemies if timed right. At level 6 you get the option to get a longer cast range. At level 9 you choose between increased duration or great slow, and the slow will make the enemy too slow to get away and leave them open to critical hits. Most AoEs aren’t as good as Marquis’ the short delay acts kinda like a nerf since it has a few ways to be useful.
You can use it to help allies escape, or to prevent and enemies escape. Slow down the enemy minions giving you time to kill them before they reach the objective, or speed up or minions to get them on their way. You can use it to protect yourself when an enemy gets close, or use it to slow down an enemy making them easy prey (Pun intended). People see temporal as a simple slow but it has more diversity than that with it’s helix choices.