Selecting particular highlights here is almost impossible since every song is so entertaining, but I feel like "Militia of Death", "Victims of the Blade" and "Sign of the Beast" are all fine examples of their uppity thrust that would immediately impress anyone into the more extreme speed and thrash of the mid-80s, or the blackened variations since. The Swedes can also show a softer and more atmospheric side to their music in the titular "Forbidden World", a gorgeous acoustic interlude, but this is an exception to the rule. Other points of interesting include "Necropolis" and "Minotaur", both of which are 8 minutes long and have a more varied, epic structure that often recalled some of the Japanese Sabbat's more ambitious offerings. The leads are almost always intensely memorable, the tremolo and muted guitars engaging and loaded with twists and turns, and the vocals simply incredible.
Imagine if you might pick around in the time stream of the 80s and draw forth the very best elements of Destruction's Sentence of Death, Kreator's Pleasure to Kill, Slayer's Hell Awaits, Bathory's first few albums, vintage Possessed and Venom's Welcome to Hell and then breed them together for several generations in some dank, forgotten kennel in a corner of Hell. About a century hence, or rather 20 years give or take, the offspring of their offspring finally emerge from some crack into the mortal purgatory and unleash the devil's music upon the unsuspecting. Forbidden World is not 'news', perhaps, and hundreds of other bands have followed a similar path, but treacherously few with such ripping, diabolic finesse.