Beat FSM on Heroic
Actually it's a pure accident, i forget to turn the difficulty back to normal before fighting FSM.
Anyway, I have used Vase+Gum to get rid of 80% of FSM's hp.
The vase also hit another 10% because of those critical hits, so i'm left with 150k hp.
Then it's pure luck. FSM tried to hit me with spirit attack for 3 times when i don't have Spark.
It's still painful considering I'm using curse-weaver suit, and FSM is agitated below 20% hp.
Maybe it's possible next time to hit those 150k hp first before going to vase/gum combination?