I saw some of party recruit only 1 Summoner and 5 dps with 2 healer on Ramuh Extreme.
I watching from https://www.youtube.com/watch?v=F5MdZW1Ennw as well and the result is some of skill from Ramuh cannot damage the Titan and the DPS easily defeat Ramuh

I suggest this ability of Titan should be get rid of its will be unfair for Tank i think