Smart is the opposite of Dumb. Dumb is a synonym of Dense. Dense is the opposite of Bright. 
Illusion is part of Magic. Security is a type of Illusion. Security is related to Protect. 
Smart <--Antonym--> Dumb <--Synonym--> Dense <--Antonym--> Bright 
Magic <--PartOf-- Illusion <--IsA-- Security <--RelatedTo--> Protect 