Ambush defense tactic research for heroes


New research for academy level 34: Hero in the city can attack 20% of the weakest attacking units based on their defense values against the defending hero.
What it means that if for example Deimos level 20 is defending the city against 1000 slingers for example he can apply the ambush tactic by attacking their defense value. In this case deimos 20 would be able to kill 200 slingers. At first I thought 20% is a lot but considering you can just cast zeus rage and kill 30% right away I don't think it's broken. What do you think about the idea ? Is it too complex ?
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