Marduk

Marduk is one of the Old Ones.   He is known as the Sentinel.
The Old Ones are the Gods that existed and ruled long before Juras Blackwood  conquered the kingdoms of Draigenmore. Killed or banished, they disappeared from memories of the realms for eons. But with the Second Great Dragon War they have seen a resurgence. With Tiamat returning to control the realms and the Sentinels of Marduk  ending their long secret existence, the existence of the old ones crept back into the realms.
Marduk was the Old One that was tasked with destroying Tiamat before she could destroy the world of Middengeard.   He did so with the aid of his two weapons of legend, his immense sword, Four Winds, and more importantly, a magic net Marduk used, the Ellit-Belit, also know as the Void of Shadows. This magical net was the only item that could contain Tiamat and held her down in order for Marduk to be defeated. It greatly diminished her power and kept her tied to the earth.
Marduk's sword, Four Winds, was reforged into the seven swords wielded by the seven Sentinels of Marduk, who also have possession of the Void of Shadows, which was used once again in the Second Great Dragon War to banish Tiamat once more.
Though Marduk was banished with the rest of the Old Ones, and remains so, he left behind a secret society, the Sentinels of Marduk to be ever vigilant to watch for Tiamat's return and protect Middengeard from evil.