is it worth investing in alchemy?

[bukimi]

But if you are lucky enough to get all really good spells in your gameplay you may need additional crystals from alchemy.
It should not be a priority but it is worth taking before upgrading the most expensive spells.
The ones that are costly and worth the cost are:
resurrection, time back, elvin, armageddon or death star (depending on strategy), geyser, demon portal and some other.
You will surely get all needed crystals by finding them or destroying artifacts but alchemy will make it possible to upgrade them much faster.