Talk:Janna/@comment-26128186-20150827000639/@comment-25489490-20150908124635

Don't get a chalice, get a tear. Your nado can proc the tear a second time each cast when you reactivate the ability to toss the nado early. Only throw this out when you're above 70%~ mana, in base, and when there are definitely no chances of being engaged upon. Because of Janna's large mana pool base, a finished Seraph's embrace will grant you 157 ap with the 75 mana mastery and without any dragon buffs or any other ap boosters. The tear is 180 less gold than the chalice which means left over money for wards aaand mana/health pots. The chalice gives surprisingly low mana sustain before lategame-sized mana pools and without other mana items, even on Janna. Rather than getting a mikaels, you could heal targets for more with ap with your lower ult cd, and keep them stronger and more lively with big shields. Ap also makes you(slightly) faster.

Math for level 7 Janna with a tear vs a chalice (assuming supp mastery tree and ignoring runes):

Janna with a Chalice of Harmony will have 795 mana to expend once reaching her lane from base. You will have 16mp5 base, up to a maximum of 44mp5 when at zero mana.(meditation mastery) To recover 100 mana for your ult or e at *zero mana will take 11.5 seconds. Including the time it takes to recall and recover mana in turret, it will take Janna roughly 35 seconds to back and return to lane at full parameters. A chalice of harmony gives yourself magic resist if you are against sona and corki lane or something similar.

Janna with a Tear of the Goddess will have 1045 Mana to expend once reaching her lane from base. You will have 13mp5 base, up to a maximum of 29mp5 when at zero mana.(meditation mastery) All ability casts that proc the tear will effectively cost 4 less mana until the tear is maxed out. A Chalice of Harmony would take 156 seconds to regenerate the 250 bonus mana at 50% mana with it's passive alone.

ps. You can't win a fight at < 200~ mana as you can only cast one ability.