Carl's gauntlets, which form over his fists involuntarily as his rage peaks over D'Nadia.
The gauntlet is a physical tell rather than a weapon in this chapter. As Carl confronts Empress D'Nadia with what she said to Signet at The Butcher's Masquerade, he feels his fists clench — and his gauntlet forms.
It is the moment the interrogation stops being tactical and becomes personal, immediately preceding the white rage that burns all three of his eyes and the temptation described in The Edge.
Armored gauntlets that materialize over Carl's hands when he clenches his fists.
Physical manifestation of Carl's rage as he indicts the empress.