The missing and mismatched slabs are from where the guardian teleported and broke them. He teleports as soon as I zap him.
I'll try upgrading to Terrasteel armour.
So I just wanted to point out another option no one seems to have thought of...this works for so many enemies...
Witchery Lycanthropy+vial/flask of invisibility or amulet of invisibility. I suggest invis vial/flask and regen or resist amulet. You have several fights worth in that time period.
It cannot target you, you get natural magical and physical resistance, a large damage and health boost, move speed, and some other bits.
You still have to deal with the purple...but even without those items, just a piece or two of magical food to stay topped off you can ignore it entirely.
I use the Witching Gadgets "Berserker bracers" for +2 damage and steadfast spaulders (for less knockback, just an always gear piece), a soujourner's/globetrotter's sash, ring of far reach (easier to hit him)
The Invisibility vial/flask is just netherwart, snowball, glowstone dust. VERY easily acquired. The most difficuly is to get a large enough coven, which with spawn eggs is very easy. Do the werewolf quests till 9 for armor rend to make things faster. Technically can be done after a single quest to gain control over wolf form only. Level 5 allows werewolf transformation.
With Tiara+eye of flugel it's even easier (assuming it doesn't glitch and not let you fly), never get touched by anything, invis flask and werewolf decimating everything...Flying Invisible Werewolf, made even better if you're using a "companion" title scroll...like a butterfly from nature's attendant...in 3rd person cam, a butterfly is decimating the gaia guardian.
Werewolves remove their armor when shifting, dropping on the ground, as well as dropping held items. Ring of magnetism is wonderful for recovery. Shifting back will make you vulnerable till you shift again or re armor.
Edit: To add to this, you can actually take on the Gaia 2 as a werewolf as well. I use flask of invisibility/resistance 2/absorption IV at the start, activate the fight, then turn into a wolf.
Gear is: Ring of far reach, Ring of magnetisim (in case of dropping things), Berserker's bracers, Steadfast Spaulders, and Globetrotter's Sash.
To make things easier you can also add in a Mariculture elemental affinity pink pearl piece (bracelet, ring, necklace) and to make catching up easier, a piece with blink (activation button+ right click with open hand).
Teleport after the teleporter.