Adds power mechanic to promote automation in Nostrum Magica

Nostrum Aetheria is an add-on to Nostrum Magica that lets players burn reagents to produce unaspected 'Aether' and store it in aether batteries. Players can transport this aether around with new tools to machines that need it to provide powerful effects. Players can also store aether in items and transport it in their inventory to power their handheld tools.

Nostrum Aetheria is meant to be an add-on that other add-ons use. Aether provides a mechanic for other systems to specify an upkeep cost to keep using. This creates on central resource players can focus on creating and improving to pay for systems that are too powerful to have a one-time crafting cost.

Generating aether is done by burning reagents in generators. Some reagents are easy to acquire (and even automate) like the growable mandrake and ginseng. Others are harder -- like Crystabloom and Black Pearl. This makes generating aether challenging to automate, because the easiest furnace to use requires three different reagents at the same time to produce any aether at all. Larger furnaces produce more aether per reagent, but require more and more (5 and 7) different reagents types to burn.

In addition to adding the aether mechanic, Nostrum Aetheria adds several tools (including magical baubles) that use aether to provide nice effects. Players can equip a charm that uses Aether to provide a small flat reduction to damage, or can charge up pendants to cast spells without the need of reagents. If they produce enough aether and have enough resources, they can construct an Aether Infuser and Aether Lenses to increase crop growth, grant speed to players in an area, or even drill into the ground!

Nostrum Aetheria is currently in version 1.1.0 and works with Minecraft 1.12.2.