1. How To Get More Attunement Slots Dark Souls 2 Achievements
2. How To Get More Attunement Slots Dark Souls 2 Walkthrough

You have to put a lot of points into Attunement to increase the number of slots for spells. You can't attune any spells until you have an Attunement stat of at least 10. From that point, every three points gives you an additional slot until you hit 16 Attunement. Slightly increases HP for each point: +2 HP (0-20), +1 HP (21-50), +0 HP (51-99) The Bandit begins with the lowest Attunement at 2 and the Sorcerer starts with the highest Attunement at 12. Each spell seems to get more charges at a particular amount of attunement points based on the amount of casts it starts off with.

In-Game Description

Attribute governing number of spells that can be attuned. Boosts spell-casting speed.

Use

• Increases the number of Attunement Slots available for Sorceries, Miracles, Pyromancies, and Hexes.
• Main stat for increasing Casting Speed. Its effect is double that of Intelligence or Faith.
• Increases Curse Resist alongside with Adaptability.
• Secondary stat for increasing Agility.
• Increases number of spell casts. The amount of the increase varies between spells.
• Slightly raises HP.

Attunement Slots

Equipment which increase Attunement Slots

Equipment which increase Spell Casts

Equipment which restore Spell Casts

How To Get More Attunement Slots Dark Souls 2 Achievements

Note: Saint's Hood, Hexer's Hood and Northern Ritual Band all work in the same way. Spell uses are being multiplied by 1.1 (1.2/1.3 for the +1/+2 versions of the ring respectively) and then rounded up. For example, having a spell with only one use, the number will increase from 1 to 1.1, then be rounded up to 2, resulting in two spell uses.

If you combine one of the hoods with the Northern Ritual Band, the spell use percentage will stack additively (10% + 10% = 20%, or 30%/40% for the +1/+2 versions of the ring). This means that, upon using both the standard version of the ring and one of the hoods, a spell with one use will increase its number from 1 to 1.2, then be rounded up to 2, resulting in two spell uses. However, using both on a spell with six uses, it will increase from 6 to 7.2, then be rounded up to 8, resulting in eight spell uses.

Spell Casts

Depending on the spell, it may start with 1, 2, 3, 4, 6, 8, 10, 15, 20, or 30 casts at base Attunement.
The table below shows how many casts become available with increased Attunement ('-' is used to indicate no increase from previous cast amount).

How To Get More Attunement Slots Dark Souls 2 Walkthrough

Note - Spells that start with 2, 3, or 10 casts can increase by different amounts. While there are two spells (with 1 cast each) that does not increase in casts (you can use equipment to gain more casts of these though).