Sometimes, but not always, using class abilities in the Leviathan raid dogs encounter removes stacks of empowering spores, making players do less damage. This seems to be an unintentional bug. It also removes the choice to use these class abilties as an interesting way to increase damage as a possibility in the raid. Here is an example of the stacks disappearing after using a rally barricade : https://youtu.be/UeSXV6f-mm0?t=419 The same exact thing can happen when players use a hunter dodge to reload their rocket launcher, or when using an empowering rift with lunafaction boots to increase their gun damage and remove the need to reload weapons.