There are several elusive Auras like Gargantua, but thankfully, rolling a Solar Aura into Sol’s RNG is relatively easy. It’s not like you’ll get it right away; Solar just has a relatively higher drop rate (read more about that below). To further increase your chances of obtaining this Aura, you can do a little prep work, and trust me, it’s very easy. So if you want to shine brighter than the Sun, this is how you can unlock the Solar Aura.
HOW TO GET GOD AURAS FAST! [Sol's RNG]
The only way to get Solar Aura is by rolling it via the game's RNG system. There is a 1/50,000 chance that you will unlock a Solar Aura by rolling. However, you can reduce these numbers to 1/5,000 if you try to roll during the day. Also, make sure that there are no weather conditions such as rain or snow while you are doing this. Rolling during a warm, sunny day will increase your chances of unlocking the Solar Aura in Sol's RNG.
Despite meeting the requirements, if you're still having trouble getting Solar Aura, I think it's time to use some improved Luck. Find Stella's Portal and brew some Fortune Potions with her Cauldron to increase your Luck by 150% for 5 minutes. If you're lucky, you'll get a Solar Aura in Sol's RNG within the first few casts.
Once you unlock the Solar Aura, you can craft various items such as Solar Device and an Eclipse Aura. You will need to go to Jake's Workshop to get the job done.