Archangel's Stat Changes
Okay my ideas is going to keep Archangel's relatively the same but place it as a better option for high tier mana sustain and round off builds better. Do note Seraph's Embrace will receive the same base stat changes as well; everything NOT indicate for both items means that nothing has changed, but i may give a quick overview of the other effects.
Archangel's Staff: Recipe: Forbidden Idol (600g) + Tear of the Goddess (720g) + Fiendish Codex (820g) + 560g = 2700g [total cost unchanged]
Statistics: +40 Ability Power [from 60] +20% Cooldown Reduction [NEW] +100% base Mana regen [from 50%] Other effects: Upgraded Mana Charge; 3% max Mana converts into Ability Power; full stacked mana charge turns Archangel into Seraph's Embrace.
Okay so less AP for Cooldown Reduction; what this means is that Archangels can be bought to smooth out builds so that you can obtain your mana sustain and CDR and then follow up with items like deathcap and void staff - so that Grail has a proper competitor for mana sustain and CDR. Grail shall grant mana regen and magic resist while Archangels will grant more ability power and mana pool instead of regen and a nice active shield when it upgrades to Seraphs. Basically the tl:dr is options for the complimentary mage item.
Hope you appreciate the idea! ~ Stacona