[Dax! What is-]
"Less talking, more running!"
While Dax was busy putting as much distance as he could between him and the creatures who emerged out of the portal in the throne room, Lux called, it appeared she was confused because Dax had enacted the MAD and Exterminatus protocol out of nowhere.
[... What's the status?]
"Code is as follows: Brimstone, thunder."
Doctrine stated that the status of weapons of mass destruction should never be spoken out loud, therefore the 125th, like all other units who used those kinds of weapons, spoke in code when dealing with them. In this case, 'brimstone' was an exotic matter annihilation ordinance direct impact missile and the word 'thunder' meant that it had already been fired and was seeking out its target without relying on external guidance, a so called 'fire and forget' mode.
[Why not lighting?]