ST816: Stalio (Japanese: ST816：スタリオ, ST816: Sutario) is an NPC in Xenoblade Chronicles X. She is a Definian and appears in Cauldros, where the party battles her.
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ST816: Stalio is a Mission Exclusive Secondary Boss and she is fought at level 44 at Infernal Ledges in Cauldros during the Affinity Mission Bozé's Ignorance.