Effie is really strong and her Wary Fighter with combination with her high defenses makes her hard to kill. A strong green unit with Hammer+ or Brave Axe+ can deal significant damage to her. A buffed mage with Gronnblade+ can also kill her pretty easily.
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Due to the low stamina cost for a level 40 stage, and the reliably counter-able enemies, this is a great map to farm Hero Merit.