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Protea, who has a powerful Mana Core, can preserve her own Saint Graph even without a Master.
For Protea, the Master is not 『a necessary keystone to bound her / a source of mana supply』, but just 『the one who summoned her』.
In the case that a Master succeeded in summoning her in a Holy Grail War, the 『duty to supply the Servant with mana』 would disappear for that Master.
It depends on the Master whether they see it as an advantage or as a predicament.

At the moment, the Servants that have 『Monstrous Strength: EX』 are only Tiamat and Kingprotea.

The enemy’s surroundings become the sea, and a giant something appears swimming beyond the sea.
It appears just like a white whale (Moby Dick), and rises while spilling the white seawater.