There is not much known fact, that Lantry's Greater Renewal ability does not just give flat +1 bonus to armor.
Instead, bonus depends from the type of armor. For example heavy disfavored armor would add bigger bonus to piercing protection, normal +1 bonus to slashing and no bonus to crushing.
And this applies to light armor too, including pieces that do not give any armor bonus.
For example, light disfavored grieves would add greater protection against piercing and no protection against crushing, when using renewal.
Instead, bonus depends from the type of armor. For example heavy disfavored armor would add bigger bonus to piercing protection, normal +1 bonus to slashing and no bonus to crushing.
And this applies to light armor too, including pieces that do not give any armor bonus.
For example, light disfavored grieves would add greater protection against piercing and no protection against crushing, when using renewal.