Tool, Stone Temple Pilots, Slash featuring Myles Kennedy and the Conspirators, former Pantera singer Phil Anselmo, Lynyrd Skynyrd, Slayer, Lamb of God, and Anthrax will play at Hellfest in Clisson, France on June 23, 2019. KISS, Def Leppard, Whitesnake, and ZZ Top will play on June 22nd, while Manowar, Dropkick Murphys, Dream Theater, Gojira, and…