Ionocidium is less defensive than Kerria. She didn't have HP drain. But she may help in an intercept team as long as you have someone with intercept for 5 allies.

Also, you can get up to five 6* Spring Star (parallel academy) for 50k reprint crystals. Time to burn stamina. And build up more crystals for Honeysuckle (parallel academy) next month (I guess?). I don't know if she is full skill full equip slot. I guess.