Agility – Movement, Action, Equip & Interaction Speed

Very useful all around stat, having at least 15 is very helpful for every character.

Knowledge – Spell Casting & Magical Interaction Speed

Every level is ~5% faster spell casting speed. Higher knowledge also increases memory slots for spells. Very valuable for casters. The magical interactions seems to not be implemented yet but is intended for portals.

Resourcefulness – Interaction Speed

Surprisingly useful though generally inferior to agility with current implementation. Each level has twice the effect of agility on interaction speed, letting you loot and open/close doors much faster. Running and closing doors behind you can be very effective with high resourcefulness/agility.

Rumored to be useful for equipment and backpack slots in future builds.

Strength – Health & Physical Power

Health and damage, critical for melee builds.

Will – Magic Resist & Magic Power

Magic resist & damage. Damage applies to spells and crystal sword.

General

Attributes at 15 = 0% bonus or negative for all stats except Knowledge which is 20

Being Below has a greater proportional negative effect than being above has a positive one. IE 12 Agi = -9% speed, 18 Agi = +3% speed