Nereid

Nereid is a Summon sequence of the Mercury element. When two Djinn of the Mercury Element are on standby, the Nereid Summon sequence can be activated. It resembles a purple-haired girl, in Japanese clothing and holding fans, arrive riding a giant tortoise and summoning an enormous water spout to engulf the enemy party.

Nereid has a base Mercury power of 60 and also does additional damage equivalent to 6% of the enemy’s maximum HP. Nereid is exactly the equivalent to two usages of the Mercury summon sequences, with no actual bonus to put it ahead of Mercury aside from using the equivalent of two Mercury summons in one turn.

Cultural Allusions
The Nereids were the the fifty sea nymph daughters of Nereus and Doris. They often accompany Poseidon (in mythology, not the game) and are friendly towards sailors braving storms. They are often associated with the Mediterranean Sea.