Your guide is still outdated. You're recommending things such as homeguard enchantments when it doesn't even exist anymore, and movement speed quints when you spend the whole time talking about this guide being meant to go with Kalista for the double-ult combo, when in that case movement speed doesn't matter as much. All-in-all, every piece of the guide works, but they don't work together for your "Big Idea" you should always aim for.

YUSSSS GALIO SUPPORT

tq for this up to date support build on galio, i just started playing galio and im nt sure what to build so this helped me a lot

I have 2 item suggestions:
first of all randuins omen would be a good armor item because after ult you could proc it for slow on everyone who was in the ult. not only that but they would all be affected by the passive for a bit from autoattacking you. plus you dont get any HP from frozen heart like you do from randuins omen.

the other suggestion is using the talisman of ascension for your support item. the reason for this is that galio inherently has tankiness and health sustain via his shield during early laneing phase. however he sorely lacks mana especially in the early game. by taking the coin you can bolster your mana regen a bit. also the tier 3 item has equivalent health regen to face of the mountain, cdr, free passive move speed, and the active which is on a ridiculously short cd and synergizes with his e for getting people in and out of fights. also synergizes with the randuins omen given the complimentary actives.

just think: use the talisman to speed boost into their midst, ult, after ult activate randuins on anyone whos still alive and help your team pick off the stragglers.

Thank you for your comment. I appreciate the feedback. :) Regen runes in general are very weak, and those that you suggested are no exception. Also, I mention somewhere in there about why I don't use hybrid pen marks on him: He's melee, and isn't going to be basic attacking champs enough to justify taking those.

Your guide isn't complete yet: you should mention it if you don't want to get downvoted.

I didn't tought of that combo, and I really like your idea ! ^^

There are indeed some modifications that you should bring: but over all it seems nice.

Try those runes instead: 9 Marks of hybrid penetration, 6 seals of health, 3 seals of health regen, 3 Quintessences of Armor and 9 Glyphs of Magic resist.