Entity Cause

Use the ec:[entitytype] parameter to list one or more entity types that caused an action.

Supports multiple (comma separated)!

ec:creeper will query activities that were caused by creepers.

Also see etag.

Negation

As of Prism 4.4, this parameter allows negation. Negating an action will exclude results. It is important to note that unlike Prism 3, the syntax has the exclamation point before the colon. You cannot use a negated parameter with its normal equivalent.

Example: /pr l ec!:creeper (Queries all entities except "creeper")