RPG mods for doom are rare, good ones are even rarer. Most RPG mods require their own levels to work, and 90% of the ones that don't are either buggy or unbalanced. Out of all of the rpg mods that DON'T require new levels, you have doom rpg/rla (which is a buggy mess - don't play!), Lithium and it's submods (which are unblanaced and one even is based on RLA, which is both unbalanced and buggy as shit), and then there is this thing, Nameless RPG lite.
This mod literally Shits all over every other Doom Rpg Mod. For it brings EVERYTHING you expect from an rpg mod, doesn't require it's own levels, works with randomizer mods, and is mostly bug free. I've tested it with lots of randomizer mods, and besides one serioss bug it has, it's great.
The Mod implements level ups, skills, stats, and spells in a very good way. As you kill enemies you level up and can increase 4 stats. You can kill enemies and get spells from their corpses. And even in randomizer Mods, this still happens, which made me drop my jaw, because I thought that was not possible. You get to put points into. stats and skills per level up, and skills are very useful, varying from sapping health from enemies bodies when you kill them to full health regen, and the ability to read their name and health when you aim at them, like in the popular mod JPHUD. It's all done so well, which deserves a lot of praise.
What makes this mod great however, is the ability to cheeze hard maps. You put tons of points into max health, and you will become a walking tank. It is especially fun in randomly generated slaughtermaps with a randomizer mod loaded.
I've tried it with a lot of randomizer mods, and only 2 gave me issues. It works flawlessly with scalliano's, omgwpns!, shades of doom with any weapon mod loaded first, and even kriegsland, a Wolfenstein mod!
It works well with these as long as you load it after them, keep that in mind.
However, if you want to load it with the bloated and annoying infernal attack, you need to load it before that or else it will break. And for some reason it breaks totally with trailblazer and metadoom. Don't try it with either. (Kinsie, Fix that!)
There is one major bug with this mod though. In doom when a lot of scripts activate at once you can get errors. This happens a lot with script heavy mods like nameless rpg lite. When this happens your level and other stats boost to the maximum level of 999. This may seem cool, but trust me it's not. By default enemy damage is a stat that levels up with you as you level up. I suggest you turn OFF enemy level scaling in the options BEFORE playing a new level with this, or else you will take RIDICULOUS damage after this happens, like simple weak zombies doing 500 damage per hit, like zombieman and crap like that. It's best to turn that feature off. Unfortunately there is no way to fix this, it 's a zdoom bug, and you just have to deal with it and disable enemy level scaling.
Besides that this mod is great.