I know that the amount of fragments to do high level potion are difficult to get but I still think that Making a Potion with these buffs will be a little overpowered.
Light Foot [max 500]
Smashing Hammer [max 250]
Coordinated Attack [max 250]
Stalker [max 250]
Maybe high level players won't buy any more chest from players who bought FSPs during bonus FSP Event
So players that buys FSP will be in disadvantage if that happens.
One possibility to prevent that from happening is giving an outstanding buffs on chests or decrease the level of some of those buffs (unfortunately) to do not be so overpowered.
*And Doubler 1000 really don't woth making for the amount of cristaline fragments required
I would like to add also that
It would be good if there were 4 Composing level
When making potions:
All potions are 100% of success
level 1 -> no benefits
level 2 -> decreases fragments cost by 1 (commom), 5% chance to spend less 5% gold
level 3 -> decreases fragments cost by 2 (commoms) and 1 (rare), 10% chance to spend less 5% gold
level 4 -> decreases fragments cost by 3 (commom), 2 (rare) and 1 (unique), 15% chance to spend less 5% gold
Everybody starts at level 1 (can create potion with up to 1 buffs)
To reach level 2 (can create potion with up to 2 buffs) -> must create 100 potions
To reach level 3 (can create potion with up to 3 buffs)-> must create 250 potions
100 X 2,5 = 250
To reach level 4 (can create potion with up to 4 buffs)-> must create 750 potions
250 X 3 = 750
This is just a suggestion