Spellguard Watchtower

3rd-level divination

Classes: cleric, sorcerer, wizard

Casting Time: 1 action

Range: Self

Components: V, S

Duration: 1 hour

within your stronghold, you can perceive the flow of magical forces more easily and can counter their manipulation. You gain advantage on any check to identify spells. In addition, you can sense the use of any spell or (including spells created by magic items) being used within your stronghold if the caster or the spell effect is within 60 feet, even if you have no line of sight or line of effect to the creature using the ability. You can attempt to identify the spell being cast with an Arcana check (for bard, sorcerer, warlock, and wizard spells, as well as the effects of magic items), Religion check (for cleric or paladin spells), or Nature check (for druid or ranger spells).

If you have identified a spell being cast within your stronghold and you have line of effect to the creature casting it (even if you do not have line of sight) and you can cast dispel magic, you can cast dispel magic as a reaction to negate that spell as it is cast. If you successfully dispel the spell, your spellguard watchtower ends.