The Saint's Equipment (聖者 装置) is a fan term referring to the set of legendary equipment found in Dragon Quest VII. Named after the demi-gods that feature prominently in the lore of the game, each item corresponds to one of said deities and the element they embody.
All of the Saint's Equipment is found in the final dungeon, and requires multiple trips through the dungeon to get all four.
(Description of the Okeanos Sword in the Nintendo 3DS Version of Dragon Quest VII.)
Named after the Greek Titan of the sea, the okeanos sword increases its bearer's attack by +140, their style by +60, and casts Oomph when used in battle. The sword also has trailing damage, similar to the Sword of Ramias, hitting a foe with Zap damage equal to 50% of the original strike's power before resistances (if any) apply.
(Description of the Gaia Armour in the Nintendo 3DS Version of Dragon Quest VII.)
(Description of the Pyros Helm in the Nintendo 3DS Version of Dragon Quest VII.)
Unfortunately the Pyros Helm provides less defense than the Metal King Helm, but is still better than all helmets purchasable with currency and a serviceable alternative for those not willing to grind the 50,000 Casino Ticket price (at Buccanham Palace: Present Casino) for the MKH.
(Description of the Aeras Shield in the Nintendo 3DS Version of Dragon Quest VII.)