one thing you do when you Shop is Fatigue. Shop entails/necessarily involves Buy. Buy is related to Acquire. Acquire is a synonym of Achieve. 
Combat is a synonym of Action. Action is a synonym of Energy. Energy is the opposite of Fatigue. Fatigue is related to Tired. 
Fatigue <--HasSubevent-- Shop --Entails--> Buy <--RelatedTo--> Acquire <--Synonym--> Achieve 
Combat <--Synonym--> Action <--Synonym--> Energy <--Antonym--> Fatigue <--RelatedTo--> Tired 