Fortune's Favor
Fortune's Favor is a pity system introduced to the Invention skill to maintain balance. After failing multiple Invention upgrades, the chance of succeeding will increase by 5%, capping at a certain amount. (This is reset on successful upgrades)
Your Fortune's Favor is displayed underneath the success rate of the item you're trying to upgrade, like this: 
Success rates
The % chance caps are as follows:
- T0 > Fortune Favor will now guarantee a successful upgrade of any base Solrot item (page 1) upon 3 failed attempts. Sagannoth rings, does not benefit from Fortune's Favor
- T1 > has no Fortune Favor.
- T2 > base rate of 50% -> Maximum Cap: 65%. after 2 fails you then start gaining the 5% increase each fail until cap
- T3 > base rate of 35% -> Maximum Cap: 50%. after 3 fails you then start gaining the 5% increase each fail until cap
- T4 > base rate of 25% -> Maximum Cap: 40%. after 4 fails you then start gaining the 5% increase each fail until cap
- T5 > base rate of 15% -> Maximum Cap: 30%. after 5 fails you then start gaining the 5% increase each fail until cap
Upgrading different items
Let's say that you are in the middle trying to upgrade your Solrot's staff T2 into Solrot's staff T3 and have +10% Fortune's Favor but you decide to upgrade your Ring of wealth (i) into Ring of greed. The +10% from your Solrot's staff T2 does not affect the success rate of your Ring of walth (i) upgrade. And if you succeed in upgrading your ring into the Ring of greed, you still have +10% Fortune's Favor when going back to upgrading your staff.