Mana cost keeps randomly increasing

While in maps, I have notice my spark skill which costs 1 mana, randomly, for varying lengths of time, increases to 10 mana per a cast. Sometimes it lasts less than a second, other times it last for what feels like forever.
Last bumped on Mar 8, 2022, 7:17:32 AM
Looking from your characters, it looks like you have Insightfulness which gives 10% reduced cost of mana on skills when at full energy shield, maybe when you don't have max ES the cost goes up to 10?
Mechanic Misconception:

Are your minions "randomly dying"? Do you have the Fleshcrafter unique equipped?
If you answered "Yes" to both of these, high chance is that your minions have over 50% chaos resistance, converting 100% of their HP into ES, killing them.
You know what, you're exactly right! Thank you very much for helping me with that!

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