You can sense the presence of magic within 120 feet of yourself. You see a faint aura around any visible creature or object within that range that bears magic, and you learn its school of magic, if any.

In addition, you gain thirteen threads. You can spend these threads to gain benefits as described below, with no action required unless stated:

• When you cast a spell, you can expend 1 thread to enhance the spell as if you had expended a spell slot 1 level higher than you did and you gain a number of Temporary Hit Points equal to 1 plus the level of the spell.
• When a creature you can see within 120 feet of you casts a spell, you can take a Reaction to expend 3 threads to interrupt that spell. If it’s a spell of level 3 or lower, the spell fails and has no effect. If it’s a spell of level 4 or higher, make an ability check using your spellcasting ability (DC equals 10 plus the spell’s level). On a successful check, the spell fails and has no effect.
• When you cast a spell that causes a creature to be healed or take damage, you can spend up to six threads. The amount of damage or healing caused to one creature by that spell increases by four times the number of expended threads.

You lose all remaining threads when this spell ends. If you spend all threads granted by the spell, the spell ends.