Invasion of Earth
During the Elder Age of Norrath, the first Rallosian forces led by the great ogre Murdunk invaded the Plane of Earth - the realm ruled by The Rathe, Council of Thirteen. Under the command of Rallos Zek, the Warlord, Murdunk was instigated to invade this realm by Rallos Zek's eldest son, Eriak. The goal was simple for Murdunk - he wanted to prove to Rallos Zek, the Warlord, that he was worthy to lead the forces of Zek throughout Norrath.
A great battle ensued and many guardians of earth perished along with numerous members of Murdunk's Rallosian army. To their dismay, the invasion was destined to fail because of the regenerating ability that The Rathe possessed. When a member of the Council of Thirteen was slain another would replace it. This gave them great advantage and although many of their guardians had been defeated, The Rathe emerged victorious. Those Rallosians not slain were thrown from the plane by the wards of The Council of Thirteen.
News of the defeat spread quickly across the Rallosian Empire. Such a dramatic failure angered Rallos Zek. He was not content to wait for the heavily scarred and injured Murdunk to recuperate and chose to enlist master tacticians and proven war heroes Tallon and Vallon. Although he was extremely disappointed with Murdunk's previous failure, Rallos Zek decided to allow him to accompany his horde in this second assault hoping to make use of the knowledge that Murdunk had acquired in his previous battles in the Plane of Earth.
With the power of the Warlord behind them, Tallon and Vallon rallied the legions of children of Zek and entered the Plane of Earth. This invasion was only partly successful – though the Rathelings' power source remained untaken, the members of the Rathe Council were captured and brought to Norrath, where one of them was executed. Where this Rathe member fell, the Rathe Mountains were raised, and Lake Rathetear formed. The Rathelings were incensed at these brazen attacks, and mourned the death of the thirteenth council member; for one of them to die in Norrath was permanent and irreversible.
While Rallos Zek was unquestionably the greatest warrior ever to exist, he knew little of the inner working of the Planes of Power. Rallos Zek was ultimately scarred and disfigured by the same wards that had banished Eriak and he lay silently regenerating in the Plane of War while the reborn Rathe exacted vengeance on the army's leaders. As the leader of the ogre nation and Zek army, Murdunk was slain.
To protect their realm from further fruitless attempts at invasion, the Rathe Council placed a curse upon all creatures of Zek. In this they were aided by several other members of the pantheon. The curse spread rapidly through the lush homelands of the giants and froze all of the lands, now known as Everfrost. The curse swept the lands of Norrath, striking any child of Zek that it touched, turning all followers of Zek into lesser beings in mind and body.
Tallon and Vallon, sensing their inevitable demise at the hands of the curse of the pantheon, called out to Rallos Zek to deliver them. Rallos Zek was sufficiently renewed by this time to summon Tallon and Vallon to his plane to escape the curse of the pantheon, but was unable to save the rest of his creations. Realizing that Eriak surely knew of the ward that protected the Plane of Earth and had failed to tell him of it, Rallos Zek brought the crippled form of Eriak before him. Rallos Zek tore from him the essence of warfare, tearing it into its more base elements and imbuing them to Tallon and Vallon, the two mortals who were able to succeed where Eriak had failed.
Eriak still retains a piece of the essence of war in his shattered and disfigured frame, but was banished to the lower levels of Drunder, the Fortress of Zek, to help in the menial tasks of forging weapons for his father's armies. To this day the great form of Rallos Zek bears the scars from the ward of The Rathe beneath his blackened war armor, a silent reminder of the failure of his only son.
Source: Seeds of Destruction: Unfolding the Lore, Part 5
Eriak Zek appears in Everquest in Drunder, the Fortress of Zek (Plane of Tactics) forging weapons just like the story states, he will speak to you and offer various replies depending on your progression through PoP:
Without the RZ, TZ, VZ flags:
You say, 'Hail, Eriak'
Eriak says 'Eriak glares at you through blackened eyes of malice. 'Foolish, but brave I suppose. As if that word has any meaning in this place. Prove yourself on the field of blood if you dare.'
With the RZ, TZ, VZ flags:
You say, 'Hail, Eriak'
Eriak grins at you coldly. 'The twins lie bleeding at the feet of Rallos, and the halls of Drunder shiver with uncertainty. But one challenge lies before you. Face the warlord and his two injured acolytes and the power of Drunder is yours for the taking. The Warlord will not fall easily. The weapons of dark courage will not be enough, your weapons will require the power of torment to topple the Warlord.
You say, 'what weapons'
Eriak says 'Though your weapons may have been effective against the twins, they will prove of little use against the Warlord. Temper them with the Torment of Saryn and you may yet be able to cleave the armor of the warlord. Insanity is not easily manipulated though. You'll have to suspend it in the blood of zek.'
You say, 'what blood'
Eriak looks at you silently for a moment. His eyes scan from your feet up to your face and linger there, staring into your eyes. He blinks once, slowly. He then draws a dagger from his waist and throws the iron gauntlet from his left hand to the floor. The dagger drifts across his forearm, and without a sound cuts into his calloused skin. A trickle of dark blood creeps down his arm and drips into a small vial in Eriak's right hand. He hands you the vial, staring through your eyes into your soul without a word.
Source: In game NPC text