Since you are changing Corki's siren because it's triggering, here are some other things to censor.

For context:

I wanted to reach out and let you know that we've gotten some great feedback regarding the siren sound that plays with Corki's Special Delivery ability.

Admittedly, the reaction that is elicited by this type of sound effect for some players was overlooked by the team, and we're going back to the drawing board on this one.

Corki himself could be triggering to people who have been involved in war, so maybe he should be deleted entirely. As could Zilean and Ziggs, you don't want to TRIGGER anybody with those bombs and explosions, do you riot?

Don't forget about Brand and Annie, those two are insensitive to burn victims and could be very triggering.

Elise is triggering to anybody with arachnophobia, so she should be removed as well.

Some people are triggered by blood, so vladimir has to go.

Jungling has to go as well, because killing frogs and wolves is animal abuse, and that could be very triggering.

What about Singed? He could be triggering to those who have experienced chemical warfare, swain and fiddlesticks are triggering to people with crow phobias, shaco could trigger people with a fear of clowns.

What if a suicidal person hears one of Karthus's quotes and it pushes them over the edge? Better censor that too.