I've heard TotalBiscuit, and the community in general, expressed their discontent towards these two eras and described them as an assload of nonsense (or something along the line). The eras I'm specifically interested about are the End Times and Age of Sigmar.

Unfortunately, a Google Search for Warhammer lore usually result in very long reads on various websites since the lore of this beast is absolutely huge! I gotta admit, I've never played the Tabletop board games from Games Workshop before, and as you may have guessed, I'm nearly clueless about Warhammer lore which the more I play Total War Warhammer, the more I wanna dive in. And the series have taken huge strides forwards since then, especially with the Warhammer license. I've been a hardcore Total War fan since I first played Total War Rome 2 (back when it was still buggy, and unbalanced.

844 A Total War Saga: Fall of the Samurai.