Flasks are used along with your Flask Wheel to activate your Tempers
Slot 1 = 1 Flask
Slot 2 = 2 Flasks (per ✰)
Slot 3 = 3 Flasks (per ✰)
Slot 5 = 5 Flasks (per ✰)
Slot 6 = 6 Flasks (per ✰)
Slot 7 = 7 Flasks (per ✰) ~ Slot 7 is ALWYAS Combo Upgrade for 3 ✰ Then it Becomes your Weapons Advanced +
Little Fact about Flasks
1st Flask that Drops will always be Attack x2
2nd Flask that drops (While Flask 1 is still on screen) Will be Defence x2
3rd Flask that drops (While flask 1&2 are still on screen) Will be Speed x2
Loops Back to Attack.
Using this method it is simple to get attack x2 on Any Slot you require.
For slot 3 -
Make 3 Flasks appear 1 by 1
Collect First Flask last
For Slot 5 -
Make 4 Flasks appear collect them all, then make just 1 appaear and collect it.
If you leave Flasks laying around on the battlefield they will still count towards the order above, so if you leave 1 flask anywhere on the map until it vanishes, your first flask to appear will be Defence.
So you will need to make another 2 appear to get attack.