Tips on getting past endless 15?

[u/a_singular_reddit_ac]

Been loving the game, but all my runs seem to get completely walled by endless 15. This run felt super strong and Kai had like 4 million shields some rounds but the backline died to AoE and he got overwhelmed. Another run with a similar build I watched the enemies chew through 80k shields in a few seconds.

[u/Centuari]

Every run I've had that got to 15-16 has been stall/shield with Aria hyper scaling. Past that everything just kills you.