Ezareth - Worth it?

The question applies to both Ezareth and Vellise honestly. As a late game, 600 days in, I'm just not sure if they'll bring that much to the table. In testing I've seen from content creators they do both seem strong, stronger than current AoE mages and will possibly enable older units that don't get much play (like Kria and Kaede, although I haven't seen them being tested with Ezareth yet). So they'll be good in Zerbus and GR1, maybe AoE Arena as well. Anywhere else though? Even in Zerbus, it's so weirdly hard that I'm not sure if they'll help me get from second to third chest due to the massive increase in fragments required. Sorry for rant lol. Let me know your opinions!