A raid event, known as a ‘Clash Battle’ will spawn randomly. This event is a very crucial part of ReArise’s gameplay. If you want to progress in Digimon ReArise, you must grind out these Clash Battles.
You will encounter Clash Battles while you’re progressing through the story/vortex stage. The spawn rate of it is completely based on RNG; so, there is no way to make them spawn more often.
Clash Battle Tips[1][]
When you beat a Clash Battle, you will be rewarded with an evolution code, which is required to evolve a Digimon. Some raid bosses can drop a code required to evolve a specific Digimon. For example, you may obtain the “MetalGarurumon Evolution Code”, which can be used to evolve a WereGarurumon into MetalGarurumon.
Most Megas available in the game need specific evolution codes to evolve. These codes drop randomly on Level 4 or higher raids.
In a Clash Battle, the level 1 boss will have 20,000 HP and will drop either an intermediate or lower grade evolution code.
The level 2 and 3 bosses will have 100,000 and 200,000 HP, respectively, and will drop either an advanced, intermediate or lower grade evolution code.
The level 4-10 bosses will have 300k, 500k, 750k, 1M, 1.25M, 2M, and 3M HP, respectively, and will drop either a specific evolution, advanced, intermediate or lower grade code.
- ↑ https://segmentnext.com/2019/10/15/digimon-rearise-clash-battle-tips/