When Sett uses its legend ability to consume a buff and retreat after taking damage from Icathian Rain, how much damage remains on the Sett champion?

Ruling: Sett's legend ability heals the unit when it recalls it. After triggering the legend ability, Sett is healed but remains on board as a legal target, so it takes the remaining damage from Icathian Rain and dies if that damage exceeds its unbuffed health.

Sequence:

• Sett takes damage instances from Icathian Rain
• When enough damage is dealt, Sett's legend ability triggers
• Sett is recalled and healed
• Sett remains on board as a legal target
• Remaining damage instances are applied to the now-unbuffed Sett
• Unbuffed Sett dies if remaining damage exceeds its health

Nuances:

• With Hextech Ray beforehand, the same sequence applies - Sett triggers its ability after taking enough damage, gets healed, but then dies to remaining damage
• Since Sett never leaves the board during this process, it remains a legal target for all damage instances