Core Concepts XCM Instructions When XCM instructions are combined, they form an XCM message that performs a cross-chain action. Take a look at some of the most common instructions. Multilocations Learn everything there is to know about multilocations, their role in XCM, and how to format a multilocation to target a specific point in the ecosystem. Weights and Fees Learn about the XCM instructions involved in handling XCM execution fee payments and how to calculate fees on Polkadot, Kusama, and Moonbeam-based networks.