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I mean we all know he was the most powerful being in the universe but what major battles except for the battle of Terra did he fight in?

Ullanor was his last major battle before he fought Horus. He fought in many major battles during the Crusade, most of which aren't named.
He fought (and won) every battle during the Unification.
Ever heard of St. George and the Dragon? Yeah, that was him too. He imprisoned the Void Dragon on Mars.
in 38,000 years of life, he fought a fair few major battles.