Orcs / Half-Orcs

Thousands of years before humans came to Khorvaire, the land was dominated by wild orcs and goblinoids of the Dhakaani Empire. The goblin empire scattered the orc tribes and forced them into harsh and unwanted lands: the swamps of the Shadow Marches, the Demon Wastes, and the depths of the Ironroot Mountains.  But in the Shadow Marches, the orcs learned the secrets of druidic magic from the dragon Vvaraak, becoming the first of the Gatekeepers.  With the invasion of the alien daelkyr from Xoriat, the Gatekeepers put the dragon's teaching to the test, creating magical seals that bound the daelkyr in the depths of Khyber and protected Eberron against further incursion from the plane of madness. Three prominent groups of orcs have survived into the present age:

• The Ghaash'kala are servants of the Silver Flame (which they call Kalok Shash, the "binding flame"), who devote their lives to battling the fiends of the Demon Wastes. Humans from the Carrion Tribes of the wastes sometimes hear the call of Kalok Shash and join the Ghaash'kala, leading to a significant population of half-orcs there.
• The Jhorash'tar orcs are a perpetual threat in and around the Ironroot Mountains, shaped by their resentment of the Mror dwarves who drove them underground. These orcs are isolated from humans, so half-orcs here are rare.
• The Shadow Marches holds the largest numbers of ores and the most significant population of half-orcs.

ORCS OF THE SHADOW MARCHES The orc Gatekeepers played a crucial role in defeating the daelkyr and binding their evil in Khyber, and their descendants continue to maintain the ancient seals and fight aberrations spawned by the daelkyr's corruption. However, many orcs succumbed to that same corruption and embraced the madness of the cults of the Dragon Below.  Orcs who follow both of these paths continue to live in the Shadow Marches, and centuries of battles between them have diminished both sides. Humans settled in the Shadow Marches long ago, and the first half-orcs helped to cement the bond between these outsiders and the native orcs. Certain Marcher clans contain humans, orcs, and half-orcs in roughly equal numbers. When playing an orc or half-orc character from the Shadow Marches, consider what circumstances brought you into the wider world. 
HALF-ORCS OF KHORVAIRE With the rise of the dragonmarked House Tharashk, orcs and half-orcs have spread through the Five Nations and beyond.  In general, the people of the Five Nations know little about half-orcs. When people imagine a halforc, they usually think of a Tharashk bounty hunter or dogged inquisitive, but a few ignorant sorts might still hold the stereotype of a "simpleton from the swamps."