From the DelveRush Wiki · Equipment
Armor enhancement
Armor enhancement adds armor and toughness to one physical piece.
Stat gain
Each level adds 0.075 armor and 0.03 toughness to the submitted piece.
Enhancement does not scale set bonuses or rune bonuses.
Risk
Higher levels can fail or destroy the submitted piece. Veyra shows all costs and chances first.
An Aegis Rune can absorb one destructive result. The attempt consumes the rune.