Vadimh
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A single Stone Skin won't get you far. Speed is essential, and it's best to get both Haste and Slow. Elven Resurrection is quite powerful, considering that blue Druids convert it from Knowledge, which isn't a very high HP stack, and that white Rogues copy the Resurrection effect onto themselves. So, if you search the map for artifacts, even with armies of 25 Dragons, Elven Resurrection can still be decisive. Dragons are easiest to take down with Archers, as they ignore half of the armor and don't reflect 40% of the damage.