On Delve Workbench there is a new category - Daily Memento Gateways. There are 4 options presented which rotate every day on day reset. There is a total of 28 boss portals that can appear.

To unlock a recipe for Daily Memento Gateway you must first add corresponded memento to your collections.

To craft them you would need Inert Geodes, Pearl of Wisdoms and Memento shards. You can obtain memento shards from deconstructing mementos. Creature mementos give one Uncommon Condensed Memory per memento deconstructed, boss mementos - Rare Condensed Memory.

Once crafted, Daily Memento Gateways can be traded between players and sold on the in-game Marketplace.

For rare loot to obtain from those bosses check out: 

• Boss banner styles > https://trovesaurus.com/deepdragons/bossmounts
• Boss mounts > https://trovesaurus.com/deepdragons/bossmounts

Following information gathered thanks to community member TheStimerGames.

▼ Monday Gateways

Delve Gateway: Deep Waspider recipe_placeable_matchmaker_bee_waspider

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Magman recipe_placeable_matchmaker_generic_lavaman_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Amperium Plasma Projector recipe_placeable_matchmaker_golem_ampcannon

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Weeping Prophet recipe_placeable_matchmaker_prophet

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Tuesday Gateways

Delve Gateway: Black Pirrot Captain recipe_placeable_matchmaker_generic_plasmablack_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Darknik Dreadnought recipe_placeable_matchmaker_dreadnought

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Bone Blade recipe_placeable_matchmaker_graveyard_wraith_boneblade_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Diatryma recipe_placeable_matchmaker_saurianswamp_diatryma

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Wednesday Gateways

Delve Gateway: Greater Balephantom recipe_placeable_matchmaker_generic_baleking_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Note: Greater Balephantom boss drops Delve Gateway: Refracted Balephantom portals that will expire in 3 hours after you log off so be sure to use them in time! These portals can also be put on Marketplace.

Delve Gateway: Blue Pirrot Captain recipe_placeable_matchmaker_generic_plasmablue_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Ifera, Underlord of the Deep recipe_placeable_matchmaker_jellyfish

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Quetzalcoatlus recipe_placeable_matchmaker_saurianswamp_quetzalcoatlus

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Thursday Gateways

Delve Gateway: Balefire Dragon recipe_placeable_matchmaker_generic_dragon_balefire

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Green Pirrot Captain recipe_placeable_matchmaker_generic_plasmagreen_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Lobstroso recipe_placeable_matchmaker_lobster

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Threzinosaurus recipe_placeable_matchmaker_saurianswamp_scissorhand

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Friday Gateways

Delve Gateway: Frozen Dracolich recipe_placeable_matchmaker_generic_dragon_ice

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Red Pirrot Captain recipe_placeable_matchmaker_generic_plasmared_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Daughter of the Moon recipe_placeable_matchmaker_luna

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Tyrannosaurus Rex recipe_placeable_matchmaker_saurianswamp_trex

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Saturday Gateways

Delve Gateway: Red Dragon recipe_placeable_matchmaker_generic_dragon_red

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Shadowshroom King recipe_placeable_matchmaker_generic_shadowshroom_king

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Timmense, the Powerful Pontoon recipe_placeable_matchmaker_manta

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Triceratops recipe_placeable_matchmaker_saurianswamp_triceratops

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

▼ Sunday Gateways

Delve Gateway: Ice Giant King recipe_placeable_matchmaker_generic_giant_ice_king

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Wight King recipe_placeable_matchmaker_generic_wight_king_boss

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Vengeful Pinata God recipe_placeable_matchmaker_pinatagod

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

Delve Gateway: Spike Walker recipe_placeable_matchmaker_spikewalker

Crafted using: Delve Workbench (Daily Memento Gateways)

Inert Geode 200 Uncommon Condensed Memory 3 Rare Condensed Memory 1 Pearl of Wisdom 1

As you might have noticed, there are 32 Boss mementos (as of Dec 2020), but only 28 portals can be crafted. Other 4 portals can be obtained in following ways:

• Delve Gateway: Flakbeard (Private 128) - unboxed from Pressure-Locked Delver's Cache or purchased from the in-game marketplace.
• Delve Gateway: Shadow Hydrakken (Private 128) - unboxed from Pressure-Locked Delver's Cache or purchased from the in-game marketplace.
• Delve Gateway: Refracted Balephantom - rare drop from Greater Balephantom Delve boss or purchased from the in-game marketplace.
• Delve Gateway: Diggsly's Demise?! - crafted at Turkeytopia Table or purchased from the in-game marketplace.

1. Volcanic Vaults

Completing dungeons in Dragonfire Peaks biome has a chance to drop Delve Gateway: Volcanic Vaults. It is tradable and can be purchased from the in-game marketplace.

The gateway works like a Private Mode delve world and has a very high probability to spawn Volcanic Vaults not only on the first floor but on all following deeper floors aswell.

You can deconstruct these gateway portals for 1 Blank Scroll each.

2. The Undrestacks

Delve Gateway: The Understacks are sold by The Enterprizing Novella NPC merchant that can appear in The Understacks biome after boss is defeated. Portals are tradable and can be purchased from the in-game marketplace.

Delve Gateway: The Understacks

Place to queue yourself for a Private Delve for THE UNDERSTACKS

Invites: Up to 8 Players total
Mounts: Delve Restricted

600
Inert Geode

You can also unbox them from Frosty Treasure Box and the Snowfest questline 2020 grants 3 of those portals on 3rd quest step.

The gateway works like a Private Mode delve world and has a very high probability to spawn The Understalks not only on the first floor but on all following deeper floors aswell.

Stable Gateways can be rarely obtained from completing dungeons in all Adventure and Gem worlds including Geode Topside. Higher Uber the world has, deeper depth Delve Gateways can be found in it.

There are gateways of following depths:

• Stable Gateway: Depth 20 - can be found in Permafrost (Adept) worlds
• Stable Gateway: Depth 27 - can be found in Cursed Vale (Elite) worlds
• Stable Gateway: Depth 35 - can be found in Desert Frontier (Master) worlds
• Stable Gateway: Depth 40 - can be found in Uber-1 worlds
• Stable Gateway: Depth 48 - can be found in Uber-2 worlds
• Stable Gateway: Depth 57 - can be found in Uber-3 worlds
• Stable Gateway: Depth 65 - can be found in Uber-4 worlds
• Stable Gateway: Depth 73 - can be found in Uber-5 worlds
• Stable Gateway: Depth 82 - can be found in Uber-6 worlds
• Stable Gateway: Depth 94 - can be found in Uber-7 worlds
• Stable Gateway: Depth 104 - can be found in Uber-8 worlds
• Stable Gateway: Depth 112 - can be found in Uber-9 worlds
• Stable Gateway: Depth 119 - can be found in Uber-10 worlds
• Stable Gateway: Depth 129 - can be found in Uber-10 worlds
• Stable Gateway: Depth 136 - can be found in Uber-10 worlds

These gateways are identical to Private Delve Portals but always open at certain depth.

Stable Gateways can be traded and put on the in-game marketplace.

You can deconstruct these gateways for 5 Inert Geode each.