Hmm...
I'll formulate an answer that's worth your time:
I might have heard about them,
But to be honest with you - It doesn't sound familiar.
So I tried painting myself a picture of how it works.
Of course, this is just my point of view, ...not saying y'all should believe me - but just understand me.
*
When I googled what: "Ro-Langs" - Meant, This is the definition google gave me:
A ro-langs is a zombie-like creature from Tibetan folklore. Ro is the word for corpse and Langs is the perfect tense of "to rise up", so Ro-Langs literally means "a risen corpse". A ro-langs is usually created by a gdon spirit, or a sorcerer. A ro-langs cannot speak or bend over, it signals its victims by wagging its tongue back and forth. They can not bend at any joints, which makes them walk with a stiff-armed lurch. In regions of Tibet there are low doorways to keep the ro-langs out.
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So basically it's just like O.P. said:
"They are essentially reanimated corpses, possessed by a ghost which is bound and controlled by the Bon Shaman.
"
That got me thinking about the:
"Tibetan Spirit Sigil":

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The term comes from Tibetian "to build" or "to construct": Tibetan: སྤྲུལ་པ, Wylie: sprul-pa; Sanskrit: निर्मित nirmita निर्माण nirmāṇa. Tulpa is sometimes used synonymously to "magical emanation", [page needed] "conjured thing", [page needed] "phantom", [page needed] and thoughtform.
Then I started to think about what Jesus said in the bible regarding:
"Belief".
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Jesus Curses a Fig Tree:
[18] Early in the morning, as Jesus was on his way back to the city, he was hungry. [19] Seeing a fig tree by the road, he went up to it but found nothing on it except leaves. Then he said to it, “May you never bear fruit again!” Immediately the tree withered.
[20] When the disciples saw this, they were amazed. “How did the fig tree wither so quickly?” they asked.
[21] Jesus replied, “Truly I tell you, if you have faith and do not doubt, not only can you do what was done to the fig tree, but also you can say to this mountain, ‘Go, throw yourself into the sea,’ and it will be done. [22] If you believe, you will receive whatever you ask for in prayer.”
In other words...
Jesus was feeling something in his heart that somehow affected the fig tree.
What do we know about the heart?
Well, we know it's the first organ to function.
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We know it is many times stronger electromagnetically than the brain.
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We know that our heart's e.m. waves can affect another person's or animal's state of mind just like a: "Transcranial Magnetic Stimulator" - Can.
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We know that our hearts e.m. waves can alter very susceptible electronics like televisions or radios with terrible reception.
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We know we can heal people using our hearts e.m. radiation:
Gregg Braden - Quantum Healing of Tumour thru the Power of Thought & Feeling
Each belief we harbor has its very own heart wave signature, just how every thought we have has its own unique brain wave signature.
Jesus was using words as a reinforcement in order to form a specific belief for his heart to translate into electromagnetic wave signatures.
Jesus was always in a state of mind called: "Gnosis", which allowed for him to perform magick/miracles.
Gnosis is a combination of a state of mind and profound knowledge of the universe and reality.
Similarly to that of being: "Lucid" - Within a dream.
When we are lucid within a dream from sleep or meditation, how we feel in our hearts literally alters the very fabric of our dreamality.
Jesus states that the lack of doubt accompanied by the presence of faith will allow for us to alter HIS dreamality; OUR Universe as we know it.
He gave us permission to alter his reality in the form cryptic/metaphoric instructions.
^Which is exactly what we are doing when we become lucid within a dream.
Seeing something impossible in a dream usually signals us that we are in fact dreaming which becomes a coherent faith in our heart. We no longer have doubt that we are dreaming, which allows for us to utilize lucidity.
Same concept applies to God's dreamality - what we call reality, but... The reason why we don't see a lot of odd dream-like things happening - is because not a lot of people know how to perform magick, they don't know how to feel the right feelings, how to form beliefs nor achieve gnosis.
But they do *more often than not* affect the world around us through the coherency within their hearts during times of misfortune. It takes hundreds of people focusing on just one tragedy to create a strong enough feeling/electromagnetic deviation within the earths magnetic field to alter nearby electronic devices, e.t.c. - so on and so forth.
Even growing plants are affected by e.m. deviations within the earths magnetic field.
So it makes sense that Jesus could more or so without any effert at all *especially because he is God/the host of our reality* make a fig tree wither using only his feelings/heart's e.m. radiation.
Even in science they talk about how the presence of either static or pulsating magnetic fields can alter matter.
That effect in science is called the:
"Zeeman Effect".
The splitting of the spectrum line into several components by the application of a magnetic field.
Let me put in terms that are easier to understand:
The zeeman effect and stark effect imply that if we change the environment of matter, the matter within that environment adapts to the change.
The stark effect is basically the reverse of the zeeman effect.
If you want to read more about how plants are affected by magnetism, please visit this link:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4154392/
Here is a video showing us the results of different magnetic deviations or strengths having an effect on plant growth:
Growing Plants in Magnetic Fields May 2014 Update
Remember how Jesus gave us an example of how powerful our hearts are?
Well in genesis, God does something familiar to this whole thing we are talking about: "The Creation Of Thought Forms/Ghosts".
For example:
Then the LORD God formed a man from the dust of the ground and breathed into his nostrils the breath of life, and the man became a living being.
The dust in the ground represents structure - like: "Thought".
The breath of life wasn't actual air, but the energy coming from God's heart, his belief that Adam would come to life and become a living being.
...
To summarize everything talked about here,
It takes a coherent Belief along with Gnosis to actually perform miracles or chaos magick.
And it takes at least (3) hearts to produce a healing miracle. Which insinuates that we would need (3) people trained to feel just the right feeling to create a living being called a: 'thought form' - that could be used for the types of magicks that can be performed during astral projection. Including -> Possession. <-Which is rarely talked about. ~