Mystra's Blessing

Mystra's Blessing is a passive feature that boosts the wielder's  Bless spell.

Description

 Bless grants an additional 1d4 to Saving Throws and Weapon Attack Rolls, and an additional 2d4 to Spell Attack Rolls.^{[See: Bugs]}

Condition: Mystra's Blessing (Staff of Arcane Blessing)

 Mystra's Blessing

Duration: 10 turns

• +1d4 to Attack rolls made with spells

How to learn

Granted by the weapons:

• Staff of Arcane Blessing

Bugs

The in-game description of this passive feature is incorrect, and actually should read:

 Bless grants an additional 1d4 bonus to spell attack rolls.

What really happens is that if a caster has this passive feature, creatures they cast Bless on gain two separate conditions:

• The regular Bless condition, granting a 1d4 bonus to all saving throws and attack rolls.
• The special Mystra's Blessing condition, which only grants another 1d4 to spell attack rolls.

It's possible to lose the regular Bless condition (due to the caster losing concentration) while retaining the Mystra's Blessing condition. In this case, the creature will be left with a 1d4 bonus to spell attack rolls and no other bonus, despite the tooltip of the condition claiming otherwise.