Bonds and the Great Bond

How Bonds work in The Ember Depths 0.21: connected runes of one colour light powers at 3, 5 and 7 sockets, with every Bond and Great Bond in a table.

For each colour, the largest group of touching sockets that carry it is your Bond in that colour. 3 sockets light its first power, 5 its second and 7 the Great Bond: the colour's old legendary power, more powerful than any rune. Tiers stack, and you can light all 4 colours at once.

A colour rune carries its own colour. A Prism carries both of its colours.
Your class rune in the Heart is wild: it lends itself to every group it touches. A Bridge (rank 8) does the same for a colour it touches. A Bond counts at most 2 lenders.
Bonds never cost points. Runes earn Bonds; Legend points earn ranks. A new rune counts at rank 1.
Three runes from the Awakening plus the Heart make a Bond of 4 at Legend 1. Always taking the leading-colour card from your picks gives your first Great Bond at about Legend 15.

All 12 Bond powers
Colour	Tier	Name	What it does
Pyre	3	Heat Haze	+5.5% damage over time and +3.5% status chance.
Pyre	5	Chain Blaze	Every 2 s a wave of fire (35%) washes 3 tiles around you, setting foes Burning.
Pyre	7 (Great Bond)	Funeral Pyre	Foes dying with Burning, Poison or Bleed explode (120% in 3 tiles) and pass every status on.
Bulwark	3	Iron Skin	+1.14% damage reduction and +1.14% max health.
Bulwark	5	Undaunted	24% of the damage you take is deferred and ticks over 4 s; each kill forgives 10% of what is owed.
Bulwark	7 (Great Bond)	Living Fortress	Block 13% of hits (half the hit); every block sends out a shockwave (275% in 2.5 tiles, 2 s cooldown).
Hunt	3	Keen Edge	+2% crit chance and +6.5% crit damage.
Hunt	5	Mark the Prey	Every 5 s foes within 5 tiles are Marked for 4 s (they take 15% more damage). Killing an elite or boss gives +9.5% damage for 8 s.
Hunt	7 (Great Bond)	Apex	Every 4 crits call a meteor (570% in 2 tiles); kills have a 28% chance to reset your shortest cooldown.
Covenant	3	Fellowship	You and allies within 8 tiles deal +3.5% damage.
Covenant	5	Common Cause
Covenant	7 (Great Bond)	Covenant of the Hearth	You and allies within 8 tiles deal +5.5% damage and take 4.2% less; your summons hit 20% harder.

Four Great Bonds need Prisms and careful Bridges: the long chase. A fourth is worth chasing, but only a little stronger than three.