Royal Jelly, Soft Tissue and Black Marble could be better if enemies outside in Mistland were available to drop them consistently. Dverger's should have a 100% chance to drop 1 soft tissue and maybe like 2 black marble and starred enemies would multiply that number. For Royal Jelly you could have some sort of spawner that will spawn seekers rarely and the seeker brood.

Or the Queen arena could respawn them even after you kill her.