"[...A Healing Crystal consumed... Current integrity: 99.3%...]"
...
The Mechanical Heart had already sustained minimal damage, and now, after consuming nine crystals, it finally regained complete functionality.
"[Core current integrity: 100%, circuit modules have been restored, Power Furnace interface has been reconstructed. Current available interfaces: 12.]"
After repairing the Mechanical Heart, Mu You connected the Silver Angel's Wings and used the remaining crystals entirely on this pair of wings.
"[You have used the last Supreme Healing Crystal; the damage to Silver Angel's Wings has recovered by 1.3%, current integrity: 88.2%.]"
Repairing the accessories was much easier than fixing the Mechanical Heart. A single crystal could restore ten times more integrity to the accessories.