What is world infestation tour headliner?

As an AI language model, I do not have access to up-to-date information about World Infestation Tour's headliner. However, I can provide general information about what is meant by a headliner in the context of a music tour.

A headliner is the main act or performer who is given the most time on stage and is the main draw for the event. They usually perform last and this is considered the climax of the event. Headliners are usually the most popular and sought-after performers in the industry, and their inclusion in a tour can greatly increase the tour's attendance and overall success. Headliners generally have the largest production budgets and perform the most elaborate and high-energy stage shows.