I thought more about runes and items today with Pantheon in mind.
I have serious mana issues throughout the whole game unless I pick up Tear of the Goddess, which I usually pick up before or after Brutalizer.
Now I thought about my current behavior, and the ways I could alter it.
TotG yields 7 mp5 and costs 520 G, which seems to be the amount where I practically never run oom .
I usually start with Faerie Charm (180g) +1 Ward +6 Pots (4 health, 2 mana) and then go into TotG later. In very, late game, I sell it to make room for my 6th item.
Now my other options:
Having TotG means I could go into manamune later down the line (which I actually have never tested), but since I get TotG early, I could turn it into Muramana quite fast I think. According to the lol wiki, Pantheon has 210+34*18 = 822 Mana at level 18. Meaning Manamune / Muramana yields 20 + 822*0.02 + [250 ~ 1000]*0.02 = 41 - 56 AD along with a pretty neat damage increase on his Q and W due to the unique effect.
Is that a viable option to sacrifice an potential item slot for? I usually go for Boots, Blood Thirster, Black Cleaver, Last Whisper, Warmogs or Frozen Mallet, +situational item (scimitar, maw, GA if I'm playing initiator etc) as 6th item. I'd need to sacrifice one of it, probably the last.
My other options os to get the needed mp5 through runes / mastery. E.G: I can deduct 3 points from the defensive tree and sacrifice in total 30 health, 2 armor, 2 magic resist and spec into 3 MP5 from the support tree. Further, I could sacrifice Armor Seals (or a combination of Armor and Magic Resist Seals), which comes down to ~13 Armor (or 6 armor and 5 MR) to gain another 3.69+ Mana reg, totaling 6.69 mp5. This would mean I could potentially play without TotG and thus, meaning I don't need to buy Fearie Charm nor Mana Pots, thus giving me 590 Gold I can spend on other stuff, making Boots +3 Heal Pots, or 5 Heal Pots + 2Wards possible as well.
The question is, is it worth it to sacrifice all that to have a steady sustain and getting AD items earlier.
What do you guys think? I'm quite poke happy with his Q and W during laning, or need Q for last hits if I have a tough match up or face 2 top laners.