Those Queen lvls are fun, but just too expensive. Noone wants celestial ore. Please let Brinks take shadow lair mats as "tokens" for shadow keys or other stuff so we can keep enjoying those lvls. There's still the chance of teams not reaching the sanctuary, so being able to trade 4 celestial ore for one shadow key shoudn't be too "imbalanced".

(Alternative: one shadow key for 3 shadow mats would mean, you could remove shadow keys from boost and let player economy do the job. Also good teams could do shadow lair runs with 3 players once in a while when a fourth guy is missing).