- Spirit Bonding through crafting is not related to level. It's tied to difficulty. A One star 50 like Rose Gold Nuggets or Twin Thread will get you less sprirt bonding per synthesis than a level 48, 80 Durability Synthesis.

- Random useless information: I just took a set of level 55 gear to 43% spirit bond in the Sylphlands and the loot drop count was at a solid 0. Good if you like to spiritbond with no inventory clutter. Bad if you like to get loot.