Here’s a calculator that will tell you exactly… but I’m happy to help the first go round…
Presuming you apply the 2% mana emblem bonus, you need a 16% mana bonus from troops or heroes (before dark tiles get launched). So 18% total.
But… if you do have the 2% mana bonus, then you can use a styx or magic level 23 troop for 17% and get 19% and be @ the 9 tile threshold.
But seriously… give the calculator a try… it is magic.
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