Hildryn is a very powerful frame for dealing damage, buffing allies and doing some crowd control. Although her main problem is how slash procs and toxin damage can destroy her! You actually get to see her weakness to these damage types in this video.
Overall I would highly reccomend her but keep in mind if you do not have these shield arcanes her survivability is hindered.
I think the coolest thing about her is how you don’t really want to run zenurik focus school with her!
If you have any additional questions let me know.