Items needed to kill a Giga: 2 Pairs of Flak armour (2 because just in case one breaks), about 100 medical brews, Shotgun with alot of ammo, crossbow with grapple hooks, and stews (Optional because they increase stats for a little time but I really recommend them): Enduro stew which increases damage, Battle Tartare which increases damage and gives a little damage resistance and increases health regen, Broth of Enlightenment because it just increases xp gained by 50% (Suppose you get 250xp by killing a creature when this is consumed, then you will get extra 125xp) Now to kill it: If you ever find it, and want to kill it, then remember: Always wear Flak armour and bring extra in case it breaks. Then grapple hook at the Giga's body between it's central body and tail, just a little closer to it's tail, then get your shotgun ready and kill it! If your health gets low just in case, then drink the medical brews. Hope this helps you.