Each one is worth 1 percent of completion and a chunk of Essence, which makes them the most efficient Essence source outside the Whispering Roots. They are also genuinely hard, more so than most of the main bosses at the point you first reach them.
Difficulty varies a lot. Xero and Elder Hu are manageable early. Marmu is a timing puzzle. Markoth is widely considered the hardest of the seven because of the shield and the rotating nail, and No Eyes fills the arena with homing ghosts.
How to collect them
You need the Dream Nail from the Seer in the Resting Grounds before any of them can be started. Walk to the grave, hold the Dream Nail input, and you are pulled into the fight. Die and you simply return to the room, so there is no lost Geo beyond your Shade.
Buy the Warrior's Grave pin from Iselda for 180 Geo to mark every grave you have found on the in-game map. Because the arenas are small with no healing cover, bring Quick Focus, Shape of Unn or Grubsong, and consider Dreamshield for Markoth. Filter this map to the Warrior Dreams category to plan a single Essence run.
What you get
All seven are worth 7 percent of the 112 combined. They also hand over a large share of the Essence you need for the Seer's rewards, specifically the Dreamgate at 900, a Pale Ore at 1200, the Awoken Dream Nail at 1800 and a Mask Shard at 2400. Doing all seven plus every Whispering Root gets you most of the way to 2400 on its own.
All 7 locations by area
Greenpath (1)
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Stone Sanctuary, east Greenpath
A weeping ghost that summons homing spirit orbs while drifting across the room. Destroy the orbs with your nail as they close in and attack her between summons.
Fungal Wastes (1)
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North east Fungal Wastes, past the acid pools
A mantis sage who slams the ground to send shockwaves both ways. Jump the waves, stay at mid range, and punish the long recovery after his double slam.
Resting Grounds (1)
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Graveyard west of the Resting Grounds
A knight who launches up to four homing nails that circle back at you. Weave between the nails, attack after each volley returns, and keep to the wide part of the arena.
Howling Cliffs (1)
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Cliff top in the north east Howling Cliffs
A floating head that fires expanding rings of spikes from the centre of the arena. Move in a circle and slip through the gaps in each ring, hitting him whenever you pass.
Deepnest (1)
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Hidden chamber, central Deepnest
Throws a giant scythe that boomerangs back and spawns smaller orbiting scythes. Track the big scythe rather than Galien himself and close in only when it is on the far side.
Kingdom's Edge (1)
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Above the Cast-Off Shell, Kingdom's Edge
The hardest Warrior Dream, with an orbiting shield, thrown nails and a shifting arena. Stay airborne, use the shield rotation to time your approach, and Descending Dark helps a lot.
Queen's Gardens (1)
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Sealed alcove west of the Stag Station, Queen's Gardens
A curled up ball that bounces around the room and picks up speed. Pogo on top of her to stay safe and control her bounce, and never stand under a rebound.