Damage Reduction by skills/champs

Anybody has some more ideas what champs i could use for even more damage reduction? I already have pythion, taras, duchess. Thats already a lot of damage reduction but am i missing something are there even more champs that reduce the damage for all the team by passives or something?

https://preview.redd.it/zwrm1d6iytze1.jpg?width=524&format=pjpg&auto=webp&s=f2a9eee3c0d5b83e6302e39470c117c6b8cbc2a7