Immunisation

Immunisation is the fifth skill in 's Pessimism skill branch. It makes him immune to stat-reducing debuffs:, , , , and.

Overview
This skill by itself is worth 5 max-power defensive gems. It's somewhat overkill, as most fights won't involve every one of these debuffs, but it frees Shulk's slots up to defend against the other debuffs. It's an expensive skill to link with a shape that usually needs high affinity, but depending on the situation it can be well worth it.