It's not your leadership. Be careful with Sacrifice b/c you CAN get more than you leadership allows & then the units turn on you until you kill enough to get it under you leadership.
Keep in mind at lvl 1 Sacrifice it gives I think 50% health to the new unit. How much health is it taking from the unit you are sacrificing? Royal Thorns have 280 life. So that means the you need at least 560 health to be taken under sacrifice. Other than that I don't know what may be causing it.
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