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Also explain them lore-wise.
I want to see some pygmy goblins defect and join Arthur's armies. They would be the first "dumb" short class in an MMO! Perfect for stealthers / CC-heavy casters (remember tanglers?) / evade-based tanks. Also they should have their characteristic monkey-jumping instead of running (important).
How it happened? After getting massacred for years by Camelot, some of them developed Stockholm syndrome and joined it.
Or... Arthur took some of them as babies and turned them into janissaries.
DAoC - Excalibur & Camlann