Spark of Inception and Increasing Max Health

I just started playing this game a few days ago and i really enjoy it but i do have a few questions.
How do you increase your drop chances of Sparks of Inception? and
How do you increase your max health?
Comments
i've got a 50 drop before and usually get 7 drops. you just have to kill enemies and do quests.
From my trial and error, the result shows better chance of drop if you fight enemy with equal or higher level than your character is
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