Rituals
If you construct a Sanctuary in your dungeon, then you can have your minions perform rituals. Rituals take some time for your minions to channel, but once they are ready you can unleash their effect when you wish. If it often a good idea to ready a ritual before you expect trouble.
Availability
Normally you only have the Sacrifice ritual available. The other rituals must be unlocked from the Veins of Evil. Campaigns usually deviate from this by having previously unlocked Rituals available from the start of a level.
Armageddon
Invokes the wrath of the Underworld upon this realm, dealing massive damage to the walls around all Dungeon Cores, Core Shards and Underhills, including your own. Once triggered it takes 20 seconds to activate. The shockwave lasts for 1 minute, preventing new walls from being built.
Assembly
Completes the assembly of all defences throughout your dungeon over time. However each Sentinel can only take 5 Defence Parts from Assembly.
With this ritual you can instantly complete a large amount of defences. Keep this ritual ready, then place lots of defences, and finally activate the ritual to complete the defences.
Avarice
Slowly converts your entire mana pool into gold over the course of 30 seconds.
Unlimited funds are at your disposal with this ritual. It may be a bit slow, but it can keep your Vaults filled when other sources of gold are running out.
Besiege
Empowers your Workers for 20 seconds, massively increasing the speed at which they claim enemy terrain, mine enemy walls, and summon constructs.
Construction
Channels your productive essence to complete the summoning of all your constructs across the map. If a construct is damaged during the process it will not be built. In some realms Construction cannot be used to summon Outposts.
Fortify
Instantly fortify and repair all walls adjacent to your claimed territory.
Overload
Instantly refills your mana and significantly increases mana regeneration for 10 seconds.
Prospector
Reveals all unmined gold, gateways, artefacts and shrines for 30 seconds.
Revelation
Reveals the entire enemy dungeon for 30 seconds.
Uprising
Converts all souls stored in your Crypt into an undead army of Wraiths, which cause as much harm as possible before slowly fading back into the Aether. They can be rallied separately to other minions.
This ritual can be very powerful if you have a large crypt filled with corpses. You can swarm the enemy, which will make it much easier for your other minions to do real damage. In many cases, Uprising alone can cripple the enemy.
Vampire
Spawns a Vampire, the most vicious minion in the Underworld, after you make 3 sacrifices at your Sanctuary Altar. Only intelligent minions are acceptable - Beasts and summoned minions will not suffice. Vampires are afflicted by an insatiable appetite for the living: they will only feed on living minions from the Prison, or whatever minions are available if there are no prisoners.
Sacrifice
Begin this ritual and then sacrifice 3 minions to the dark god Mendechaus, by dropping them on the Sanctuary Altar. Mendechaus may choose to be generous in return.