Ayewale
He/Him- 1,065
- 753
The Feat
Versus Thanos Black Bolt is able to make Thanos bleed and staggers him (can't use Thanos's armor breaking for scaling since it's clearly destroyed in the last panel). This is the same Thanos who has no-sold attacks from Odin (at least 3-C), is unaffected by two attacks from Thor (at least 3-C) and is unaffected by a 'full-force' attack from the Silver Surfer (3-A). Thanos being damaged whatsoever puts him above all of this.The much more explicit feat is versus World War Hulk. Black Bolt straight up blows him away without using his full power. Hulk does win the fight offpanel but we can reasonably assume it wasn't easy--hulk was not holding back at all in the first panel. Also worth noting is that this is a Hulk who was extremely mad at Black Bolt, so this feat is at least 3-C and at most 3-A.
The Conlusion
Black Bolt's voice either gets upgraded to being "up to 3-C with his voice" or, if you're being more generous, "up to 3-C, potentially 3-A, with his voice".