If you stay under his feet, he literally can't do anything to you unless you move into his foot stomp. Also watch out for his tail flop.
When he goes up in the air, run away to near the walls of the area, and then run back under his feet when he lands.
Guardian Dragon was one of the easiest boss fights in the game in my opinion, if not the easiest.
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I think the last giant is way too easy for a magic build :p
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I must just suck lol
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It doesn't mean you suck, it just means you probably have a different play style than me. Keep at it! Try what I said, hopefully it helps.