2,900 g
This item page for Manamune reflects public Arena Mayhem data for patch 26.19.
Unique - Awe:
Grants bonus attack damage equal to 2% maximum mana.
Unique - Manaflow:
Grants a charge every 8 seconds, up to 4 charges. Consumes a charge on-hit and whenever affecting an enemy or ally with an ability to grant 3 bonus mana, increased to 6 for champion targets, up to a maximum of 360 bonus mana. Can only be triggered once per cast instance.
Awe grants a total of 10 bonus attack damage by itself without any stacks of Manaflow.
With Manamune's attack damage stat this totals to 45.
Standard recipe — Mayhem build paths may vary