The phrase "special modifiers" refers to certain words or symbols that are added to a sentence or statement to change or enhance its meaning. These modifiers make the sentence more specific or emphasize a particular aspect of it. Full definition
You can also create custom challenges by loading up an existing room and adding in special modifiers, such as disabling all your gadgets, making enemies tougher or even adding an aura which randomly moves from goon to goon granting them invincibility. (wolfsgamingblog.com)
The Nightfall Strike is a special event version of a regular strike, however Bungie and Activision have added special modifiers to add a little spice to the gameplay. (thatvideogameblog.com)
There are a bunch of different modes to play with their own dynamics and objectives, and there are even special modifiers that can be applied to each match, further randomizing the combat. (theswitcheffect.net)