When comparing Microlite20 Purest Essence vs Heroes Against Darkness, the Slant community recommends Heroes Against Darkness for most people. In the question“What are the best tabletop RPGs?” Heroes Against Darkness is ranked 33rd while Microlite20 Purest Essence is ranked 54th. The most important reason people chose Heroes Against Darkness is:
The game uses a single "d20 + modifier ≥ target" mechanic for everything. Characters can be created in less than 5 minutes. The writing is concise and clear.
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Pros
Pro Easy to start
If you are looking for a game like DnD, but much easier - try Microlite20 Pures Essence with Ultimate Fantasy supplement.
Pro Rules will be familiar to any veteran D&D player
As Microlite20 is a stripped down version of the d20 SRD with the same classes, races, items and abilities, it will be easy to understand by anyone that has previously played a D&D game. Especially D&D 3.x.
Pro Compatible with d20 SRD
Any material written for the d20 system can be used with the Microlite20 system. All creatures, items, monsters, spells, etc from any d20 SRD licensed resource are compatible with the Microlite20 system.
Pro Clear writing
The writing is very terse and to the point. There's very little in terms of fluff. As such the rules are easy to comprehend and reference.
Pro Simple rules allow easy customization
m20 remains compatible with the d20 SRD, but rules are lite enough that adding modifications to the system is trivially simple.
Pro Focuses on simplicity
The game uses a single "d20 + modifier ≥ target" mechanic for everything. Characters can be created in less than 5 minutes. The writing is concise and clear.
Pro Deep, without being cluttered
A lot of meta-tools such as templates, etc, that make combat encounters incredibly simple to construct. Great tools for creature-building. A lot of good information on world-building. You can make any type of game efficiently, from hack-and-slash to role-playing. If you have played in a D&D campaign, this is a great choice for your first outing as a GM.
Cons
Con Combat can potentially get stale
Due to the fact that combat is simplified to just 3 variables (AC, HP and attacks) a less experienced DM runs the risk of creating repetitive combat.
Con Requries prior knowledge of RPGs to completely understand
Some knowledge will be required to understand the rules as there are some unexplained conventions that are presumed to be understood.