For the duration, your eyes glow faintly blue and you can see magical auras out to a range of 120 feet. You gain the powers of a Detect Magic spell, except that arcane sight doesn't require concentration and you don't need to spend an action to use it.
In addition to being able to see the auras around you and determine the school of magic, if any, to which they belong, you can also sense the strength of the magic. The more powerful the magic, the more intense the aura. As an action, you can make an Intelligence (Arcana) check to determine whether the aura comes from divine or arcane magic, and the strength of the most powerful spell or spell-like ability a creature has available. The DC for this check varies. To sense an active spell or spell slot, the DC is 10 + the spell level. To sense a spell-like ability, the DC is 10 + the creature's CR. For an item, the DC is 10 + 2 for every level of the item's rarity. Note that an available spell slot is as discernable as an active spell;
In some cases arcane sight can be deceiving. For example, if you use it on an Archmage who's used all their spell slots above 3rd level, you won't sense that power.
At Higher Levels. When you cast this spell using a 7th-level spell slot or higher, you automatically know which spells or magical effects comprise an aura you sense.
* - (a broken eggshell)
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