As swain, Remember to take as many neutral, objective fights as you possibly can. Your Ultimate R and E will help you massively with it.

Since you will be diving into the enemy team, you will want to get a defensive item like a Zhonya's Hourglass. This will let you use your Ultimate R effectively.

You will need to take care of your backline and see that they don't get doved and killed. If an assassin is trying to kill them, E the assassin immediately.         As swain, Do not forget to take as many neutral and objective fights as possible. Your Ultimate R & E will help you massively with it. Since you will dive into the enemy team, you will want to get a defensive element like a Zhonya Hurglass. This will allow you to use your Ultimate R effectively. You will need to take care of your backline and see that they are not being subjugated and killed. If a murderer tries to kill them, E kills him immediately.