Bardic Protection Knots

Bardic Knots for the most part seem underdeveloped, like, something fantastical was planned for them, but nothing ever really happened to make them truely powerful bardic-only items.

So....

Celtic knotwork is much like a circle, perfect knotwork loops on and onto itself over and over again, infusing one end with another. The complexity along with it's almost magical tendency to sing in a bard's ear make it the perfect magical bardic item.

Spirit Knots, would conceivably protect a bard's spirit from harm, or at the least halve mental effects. Like... Badass Moonmage stares into your eyes, You are stunned! You hear the gentle whisper of music eminate from your Spirit Knot replacing the evil influences of Badass Moonmage. You shake off the spell.

Soul Knots, gives bards a protection bonus vs. aether and harmful spiritual spells.

Blood Knots, could replenish Bardic Mojo at a faster rate when worn.

Eternity/Life Knots, I want to say Reincarnation, but that might be going too far. Perhaps a continuous Wren Protector, or Bird Familiar when worn? If the bard dies, and departs a flock of birds enshroud the gravesite, making it harder/ more difficult to graverob said bard. Perhaps they might even peck and dive attack anyone who tries to dig up the grave?