Emerald Robe
Increases maximum mana by 60 11% reduced mana cost Enchants gem-powered magic Emeralds light the night
2Changed since 1.4.5.6
Measured by comparing the game's own item data between 1.4.5.6 and 1.4.5.8. See the 1.4.5.7 and 1.4.5.8 notes for what the change was for.
How to craft it
LoomSet bonus
The bonus applies while the helmet, chestpiece and leggings are all worn together.
a middle of the road robe
Every gem robe does the same job in the shirt slot and they differ only in how much magic damage they carry. Emerald lands in the middle of that run, which makes it a fine placeholder while you keep digging for a better gem but not something to plan a build around.
the hat is the real decision
The set bonus lives on the headwear, not the robe. Wizard Hat for critical strikes, Magic Hat for the bigger mana pool. Pants are irrelevant to the bonus, so wear whatever has the most defense on it.
the tim trick
Wearing any gem robe without a Wizard Hat sharply raises how often Tim spawns underground. If the hat is the piece you are missing, put the robe on before a caving trip and let him come find you.