Warhammer Online has a very unique leveling system. This is one of the few online games that you can tell about everything you do while playing. It just means that you don't have to be in a group with this guide.
Now to speed up to level 40 in the fastest time, you want to follow this guide, to do your leveling on a single, doing all the PvE Quests in the guide. Tistaminis offers you a wide range of Warhammer 40k game models including, Chaos Daemons, Space Marines, Death Guard, Genestealer Cults, etc.
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When you are doing your Warhammer quests, you will want to queue for all the scenarios available in your tier. Another strategy that you can adopt using this Warhammer online guide is to do public Quests when you come among them.
You should only do a public quest if lots of people are already doing them, and you can join Warband so that you can get EXP from other members in Warband. Until you reach the elite influence, do all the Warhammer Public Questions and you can buy a reward.
One rule to remember for this is that if there are less than 5 players who perform the public quest, then do not bother to do it. You need to know that for the Warhammer Leveling System, Warhammer Online has a very unique and very useful search system.