There are a total of 82 Constellations, each made up of between 3 and 8 stars, which total 434.
On gaining their first Devotion point, the player can choose one of the stars of the Crossroads constellation to spend it in. This grants an affinity point which unlocks other constellations. These in turn grant the Affinity required to unlock constellations of a higher level.
Constellations are ranked in 3 main tiers, from center to the edge of the Devotion window:
Tier 1 Constellations requires a single Affinity point and give a large Affinity bonus.
Tier 2 Constellations require between 8 and 11 Affinity and give a smaller Affinity bonus.
Tier 3 Constellations require 20+ Affinity and give no Affinity bonus.
Note that Constellations are self-supporting, and their own Affinity bonus counts toward their Affinity requirement. Points can thus be re-allocated from other constellations used to reach them when their bonus is no longer required.
Each constellation generally has several key areas of focus, and it can be very convenient to visually display those areas so as to chart a course for building your character.
To the right is an image updated for Ashes of Malmouth that displays the major bonuses. Please note that not every single bonus is listed, but the most impactful bonuses are listed. The 'Pets' designation means the contellation has bonuses that apply to pets.
WARNING: Some (many?) stats below need to be updated. In particular a number of damage stats have been doubled. New stats have been added to Constellations. Some Constellation Skills need to be updated with new and altered stats.
+25 Spirit +3% Offensive Ability Bonus to All Pets: +30% to All Damage, +5% Attack Speed
+45 Offensive Ability 15% Chaos Resistance
+100% Vitality Damage +100% Chaos Damage
5-24 Chaos Damage Bonus to All Pets: 60% Total Damage, 10% Crit Damage
Hungering Void (100% Chance on Attack) Energy Cost/second Health Cost/second AoE % Crit Damage % Vitality Damage % Chaos Damage +% Total Speed Chaos Retaliation % Chance of 3 Seconds of Terrify Retaliation Pet Bonus: % Total Damage % Crit Damage % Chance of Stun Target for 1 Second % Chance of 30% Slow Target for 3 Seconds
+35 Offensive Ability Bonus to All Pets: +5% Offensive Ability
+80% Bleeding Damage Bonus to All Pets: +30% Total Damage
20% Vitality Resistance Bonus to All Pets: 6% Total Speed
75 Bleeding Damage over 3 Seconds +80% Bleeding Damage with +50% Increased Duration
15% Elemental Resistance 15% Bleeding Resistance +3% Maximum Bleeding Resistance Bonus to All Pets: +80% Total Damage
Howl of Mogdrogen (20% on Attack) x Bleeding Damage over 3 Seconds +x% Bleeding Damage 15% chance of reduced target's Defensive Ability +x% Attack Speed Bonus to All Pets: +% Offensive Ability +% Total Speed
Increases Armor by 4% 30% Reduced Stun Duration 30% Reduced Freeze Duration +3% Maximum Pierce Resistance
Stone Form (15% on Block) AoE Increases Armor by x% Increases Armor Absorption by x% x% Pierce Resistance x% Reduction in Poison Duration x% Reduction in Bleeding Duration +x% to All Retaliation Damage