Step 1: Identify gruz
The first gruz we encounter in Hollow Knight is known as 'Lil gruz'. Lil gruz floats arounds and will gruz you if you get too close. How do we know lil gruz is gruz? It's in his name you green fool.

Step 2: What is gruz?
Everyone knows Hollow Knight commited tax fraud and got locked up in black egg to keep out hot bug mommy. But we might be looking at the wrong gruz, so to speak. If you look close when hitting Hollen Nite, he drop little orange thing. Orange also comes from gruz. Orange = gruz.

Step 3: Defeating the gruz
In order to destroy gruz, one must apply green. You see, in the greenpath, it's green. Therefore, I conclude that green must destroy gruz. Hmmm. Indubatibly.

Step 4: green ending
Ever heard of green humor, buddy? Basically, you need to beat lord of all gruz in gruzpath, to unlock secret green ending. (lord of all gruz is great grozz charger)

step 5: the grussy

steP 6: The grildo

Hope you enjoyed the guide. Now you will understand the gruz lore a little better. It's very deep. Have fun and dont forget to grildo that gruz.