Warbringer Nemesis Titan
"The Warbringer Nemesis Titan is a new class of god-machine armed with an artillery piece capable of transforming your chosen grid coordinates into a white-hot crater. This massive engine of destruction has been designed to look right at home alongside its brethren. It is our most detailed yet, with a crewed upper deck featuring a spotter, a loader and a massive, revolver-style loading mechanism for the main gun."
- – Warhammer Community
"The Warbringer class of Titan is renowned for the many sub-variations of the class in use by the various Titan Legions active within the Imperium, and the most common pattern seen on the battlefields of the Great Crusade was the Nemesis. This immense war machine is designed to destroy enemy Titan-class targets at range, acting as a dedicated fire support platform in the maniples it is assigned to. However, sitting in between the more common Reaver and Warlord classes, its mass and firepower often see it assigned to the front lines of the battlefield alongside the various classes of Battle Titan. Its reinforced frontal plating allows it to weather most return fire with casual ease, and its defence batteries render it well-protected against aerial attacks, though its relatively light rear armour can leave it vulnerable to flanking attacks by ground vehicles."
- – Forgeworld
Warbringer Nemesis Titan is Forgeworlds newest attempt to part fools from their money. The Warbringer class Titan is a new branch of Titan warmachine derived largely from a combination of the chassis of the Warlord Battle Titan and the legs of the Reaver Battle Titan, thereby making this Titan somewhere in-between the two in terms of size. The somewhat grimderp design was criticized heavily for its T-rex arm syndrome, oversized cannon and the inability of its AA guns to fire infront of the Titan.
The name 'Nemesis' refers to a variation on a standard Titan modified to carry a heavy weapon above its class size (and has nothing to do with the Psi-Titan Warlord variant, despite the term often being applied to Force Weapons). For the Warbringer, this means mounting Warlord-grade weaponry on its carapace, giving it a greater punch than its size would otherwise allow. The Warbringer Nemesis is built specifically for siege warfare, artillery bombardment and anti-Titan warfare. That oversized six-shot revolver ain't for show and it is a giant Quake Cannon. Oh yes, a giant Quake Cannon, as if the Quake Cannon is already big enough. But this time, that Quake Cannon is rapid firing. Oh yes! We finally have a good Warlord counter now.
Its as if some random Magos walked around and inspected a Warmonger-Class Titan and said to himself, "You know what? These things are too expensive to mass-produce. So why don't we shrink it in size and create an army out of them?" Thus, the Lord Emperor noticed and giveth. Kiss your asses goodby to your Hive Cities and your fortifications you Heretical Faggots, 'cause Grandpappy Emprah has just given the green light to open several billion cans of whoopass!
It has yet to appear in any official fiction, currently existing just to make the available unit lineup for the tabletop game more tactically diverse and financially profitable.