Originally Posted by
Boiled-Lobster
It's not necessarily a requirement, but here's how the cloak works:
It has 15 levels, each with it's unique corruption reduction effect or a different effect,
at cloak level 12 you will get a primary stat boost similar to that of legion's concordance
at cloak rank 15 you've maxed out your cloak.
Beyond level 15, doing these TWO events weekly ( and not twice the same event ) will allow you to upgrade your corruption reduction effect on your cloak by another 3 points;
Either kill N'zoth or do a full vision clear ( on normal aKa no hardmode, or with hardmodes aKa flame leviathan 2.0 )
The cloak surely helps , especially with the added bonus corruption brings, without the cloak you can wear perhaps, 1-3 pieces depending on tier effects, with the cloak ( and upgrades ) it varies from 1-6 ( the higher the cloak, the more pieces you can wear ) and thus the bigger advantage it brings in pvp.