The Sound of Thunder

**The Sound of Thunder** is the fourth and final Mission of Act 1's fourth and final Chapter, Blue Dog Hollow. The Mission can only be played in Campaign mode, as it is not available in Trial of the Worm.

## Mission overview

The Mission begins in the Saferoom above the Blue Dog Mine. Upon exiting the Saferoom, the Cleaners must use the Howitzer left by Pelisarro's team to seal the main tunnel. Multiple 105mm Rounds can be found in boxes around the area and after several shellings, an Ogre appears. Once the tunnel is collapsed, the Cleaners enter a nearby Humvee and escape the area.

### Howitzer shells

In the offline Campaign and Training modes, players will always need five 105mm Rounds from the Howitzer to successfully complete the Mission, regardless of Difficulty. However, in online cooperative mode (co-op mode), the number of shells required increases as the difficulty level escalates, up to eight in No Hope difficulty.

On the ground, players can drop up to five shells outside of the boxes. Adding an additional shell to the ground will replace the first one collected. Nevertheless, players can still load a shell into the Howitzer or hold one without affecting the availability of the five left shells on the ground. The box located to the right of the Howitzer will consistently contain one shell, regardless of mode and difficulty.

When it comes to the boxes on the right side, closer to the players, each shell can only be taken once from a box. However, the furthest shell box on the left side, located on a truck, contains an infinite supply of shells. If a shell received damage from a Cleaner after it was left by a player on the ground, it can be destroyed, potentially causing nearby picked shells to also be destroyed. Shells that remain untouched in a box cannot be detonated. If picked shells are positioned too close to the Howitzer when it is fired, they will be thrown away due to the resulting knockback. Shells cannot be destroyed by bash, including Combat Knife) or Flashbangs.

### Hordes

In Recruit and Veteran difficulty levels, the Hordes are triggered to spawn after the first firing of the Howitzer. However, in Nightmare and No Hope difficulty levels, Common Ridden randomly appear as soon as the door from the Saferoom is opened, accompanied by Mutations, including Cultists. These Hordes become more active when the Howitzer is fired. The spawning of the Ogre depends on the difficulty level and whether the Mission is played in offline Campaign/Training, or online (co-op) Campaign mode.

In offline Campaign mode, one Ogre is triggered after the third shell is fired, regardless of Difficulty. In Nightmare online Campaign mode, two Ogre bosses are spawned instead - after the second and fifth rounds are fired. If the Mission is played online on No Hope difficulty, the bosses are two as well - an Ogre will spawn after the second and fourth shells are fired using the Howitzer. There 're no appearances of other types of Bosses or additional Ogres.

If the Use Speed is sufficient, the first Ogre can be eliminated with a a shell, typically requiring at least 60% bonus Use Speed overall. However, achieving this method against the second Ogre in online mode is nearly impossible, as it enters the arena directly without initially pausing to roar, unlike the first Ogre.

## Accomplishments

**The Sound of Thunder** must be successfully completed in order to satisfy the unlock conditions for the following Accomplishments:

## Changelog

### 2022

 December 6th, 2022(Patch 1.13)
 December 6th, 2022(Patch 1.13)

## Further Notes

* The Howitzer's name the Cleaners are using in this Mission is Alice.
* The howitzer, pronounced as /ˈhaʊ.ɪtsər/, serves as an intermediate artillery weapon positioned between cannons and mortars. Its remarkable long-range capabilities and ability to deliver projectiles on a flat trajectory make howitzers highly valuable when integrated into a battery formation alongside other artillery units like long-barreled guns, mortars, and rocket artillery.