File:Karn.gif Karn is a Super Rare unit appearing in Metal Slug Attack. Much like its twin brother, Shoe, Karn shares similar attack damage, health, production, required items, etc. The most obvious differences between the two are their special attacks and AP costs (with Karn being slightly more expensive and powerful). Karn's unit parts are available via Battle Shop or Elite 8-6. Karn's special attack lacks missiles (although its long-range attack has it), but its very useful for wiping out large numbers of units, especially if Shoe is present as well.