Jewels not compatible

Timeless jewels dont synergize with The Perandus Pact or many of the other aura jewel types. Especially when working with something like Lethal Pride, that just adds some str to smalls and random notable effects, Perandus Pact doesn't add any of it's effects. I haven't tried every timeless jewel, but I have tried a few of two different types, and both are completely overwritten with the Timeless Jewel's effects coming on top.

Passives conquered by timeless jewels cannot be further modified. Pretty sure if you check the advanced description it notes this.