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"Dark Jeroid" may not look like a very strong monster with and ATK of 1200, but its effect reduces the ATK of a monster by 800 when it is Normal Summoned or Special Summoned.
This means that "Dark Jeroid" could really destroy a monster with ATK 2000 or less in battle.
But if it is Summoned when there is no other monster on the field, it decreases its own ATK. Be careful.