Summonable heroes are not unique to that particular faction but have appeared lore wise in it. Therefore they are relegated to temporary summons. They have access to all their abilities even though they are often more limited than the usual heroes. They can change the balance of a game easily depending on how they are used. They are often tier 2 or 3 powers, sometimes they will be part of a tier 4 power but in that case they won't be standalones.

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