Use Geometry Nodes to create particles, use node shader to partially cover the object and Use Modifier to create chaos of particles. Requires Blender version 2.9 or ...

How to make Lava material in Blender 2.9 Timestamp 00:00 Introduction 00:15 Setup 00:59 Base Color and Normal 02:25 Emission 03:02 Glowing Hope it is useful to you Thanks for watching Subscribe!