ok I see .. but you can do the same (restart battle) by retreating in the very beginning of the battle - it still costs 12 Trilium, but you will get new map generated when you travel into the battle again. We think that is should have some cost for the player to 'restart battle'.
The Aldehyde is linked to the Focus gaining - so if you Focus charges to 100% (for the Priest, or whoever has the mutator item equipped) you gain 1x Aldehyde injection. Was the battle advice about this feature not clear enough? There is also a help screen for this topic.. Let me know so we can improve it for the player :)