Ritual Altars have 15% chance to be built on Summoning Circles, summoning an additional Boss when activated

Summoning Circle Bosses in Cleansed Areas have a 25% chance to
have an additional Monster Modifier

Summoning Circle Bosses with additional Monster Modifiers in Cleansed Areas have a 5% chance to drop a Fracturing Orb

20% increased chance of Summoning Circles

20% increased chance of Summoning Circles

20% increased chance of Summoning Circles

20% increased chance of Summoning Circles

20% increased chance of Summoning Circles

20% increased chance of Summoning Circles

Summoning Circles have a 10% chance to be encrusted with Essences, adding multiple Essences to the boss

Summoning Circle Bosses have a 25% chance to have an additional Monster Modifier

Overseer Tablets also provide 20% increased Effectiveness to Summoning Circle Bosses

Summoning Circles have 10% chance to summon an additional boss

Summoning Circles summon packs or a more powerful Boss

Summoning Circles in Non-City Areas have 5% chance to instead
summon a random Deadly Map Boss

10% chance to upgrade the boss of a nearby Map into a Powerful Map Boss when completing Summoning Circles

10% chance to reveal a distant The Ezomyte Megaliths Map when completing Summoning Circles

Summoning Circles in City Areas have 5% chance to instead summon a random Citadel Boss

Ezomyte Cities contain an additional Summoning Circle

City Areas have 50% increased chance to contain Summoning Circles

City Areas have 50% increased chance to contain Summoning Circles

Swamp Areas have 50% increased chance to contain Summoning Circles

Summoning Circles in Grass Areas have a 20% chance to also summon an Azmeri Spirit

Grass Areas have 50% increased chance to contain Summoning Circles

10% increased chance of Essences

10% increased chance of Summoning Circles

10% increased chance of Rogue Exiles

10% increased chance of Summoning Circles