Z Giaorugu seems to have surprisingly low health compared to other zeniths. Most zeniths 4s take me an average of 5 minutes to kill, closer to 4 with lots of iframing for Stylish Assault and Furious buffs.
Being able to stand in its ice field helps me deal a lot more damage than otherwise.
Hope you enjoy the video!
Recorded on the Rain Frontier server at https://discord.gg/TcpkpUpeGw