Did you heal?
Or did the Herbalist  autoheal you after a boss attack ( assuming playing on desktop, not app).
Both of those actions will consume cash without getting attacked.
When I heal or the system heals me, it takes  more coin than a handful of attacks on a boss. Amount used would vary based on your total health
					 
				
			
			
			
		 
		
		
		
			
			
				Last edited: Jul 24, 2018