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.