The word half-giant is actually incorrect. Half-giants are actually full giants, but of a shorter and more intelligent strain. They originally lived among other giants but eventually ran away because of the cruelty placed on them. Giants as a rule, still consider half-giants as theirs. They see them as their property and will enslave one if found. Half-giants now live mostly in harmony around other species and enjoy the magical protection that these other species give to them. In return, the half-giants, are usually employed to perform all of the most difficult and strength-demanding work. Because of this, half-giants are usually poor and always looking for a better way of life. Most free half-giants are more than happy to join adventuring groups and, due to their strength are valuable assets.
Reality
1250-1300
Giants are another of the monster species that have been written about in the Bible. Here are the quotes I could find about them.
Genesis 6:4
“There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown.”
Numbers 13:33
“And there we saw the giants, the sons of Anak, which come of the giants: and we were in our own sight as grasshoppers, and so we were in their sight.”
Deuteronomy 2:20-21
“(That also was accounted a land of giants: giants dwelt therein in old time; and the Ammonites call them Zamzummins; A people great, and many, and tall, as the Anakims; but the Lord destroyed them before them; and dwelt in their stead;”
2 Samuel 21:22
“These four were born to the giant in Gath, and fell by the hand of David, and by the hand of his servants.”