Ars Solum (ソロアルカナム Soro Arukanamu, lit. "Solo Arcanum") is a Deck Command that can be used by Terra in Kingdom Hearts Birth by Sleep. It is a multi-hit combo similar to Ars Arcanum that can add up to three additional hits if one presses 
when the on-screen prompts appear. Being a possessed version of Terra, Terra-Xehanort can also use a version of this Deck Command, granted he increases the amounts of hits it can land as well as its power through the darkness.
Etymology
Ars Solum is Latin for "Art of the Earth" or "Art of the Land." This may reference both the meaning of Terra's name as well as the fact that only he can use this Deck Command.
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