What happens if you inflict two of the same effects on one target?

Alensin

For example, let's say ghost blade uses scorching power which will reduce a targets defense by 30%. After that, Kaien Shiba uses Suiten Sakamake which reduces a targets defense by 15%. So do the two effects merge and cause the target take 45% increased damage? Maybe Kaien Shiba's effect overrides scorching power, and now the target only has 15% defense reduction? Or does it stay at 30% defense reduction?

Potdenutella

It doesn't matter if the effect is stronger or longer, the effect always gets overwritten by a recent one.