Geo

Geo is the currency of Hallownest used in Hollow Knight. There are three types of Geo drops:

Use
Used to buy goods from Merchants or to pay tolls for Stag Stations and Benches. Also used to pay the Nailsmith to upgrade the Knight's Nail.

Tolls
 * for all Stag Stations
 * for all Bench Tolls

Merchants
 * for all of the maps from Cornifer ( if bought from Iselda)
 * for Iselda's stock (Charms and Map Pins)
 * for all three Fragile Charms bought from Leg Eater ( if wearing Defender's Crest)
 * to unlock all of the trials at the Colosseum
 * to make a bank account with Millibelle
 * to fully upgrade the Nail
 * to buy everything from Salubra ( for the Charms + for Notches +  for her Blessing)
 * to buy everything from Sly
 * to upgrade all Fragile Charms to Unbreakable at Divine

Miscellaneous
 * to learn Dash Slash from Nailmaster Oro
 * to be thrown into the fountain found in Ancient Basin for a Vessel Fragment

Infinite Purchases The following can be bought at infinite supply, provided the Knight is not in Steel Soul Mode.
 * per Rancid Egg bought from Tuk
 * per repair of a Fragile Charm at Leg Eater

Summary of Costs
 * to buy everything at the most sparing prices
 * to buy everything without extra exertion ( difference)

How to Acquire
Geo can be gained in several different ways:
 * Defeating enemies
 * Destroying Geo depositsGeo Deposit.png
 * Opening chests
 * Selling Relics to Relic Seeker Lemm
 * Rescuing Grubs for Grubfather
 * Completing a Trial at the Colosseum of Fools
 * Giving Rancid Eggs to Steel Soul Jinn (Only available in Steel Soul Mode)

While the Gathering Swarm Charm is equipped, a small swarm gathers any dropped Geo for the Knight, except those fallen in acid. Fragile Greed (as well as its unbreakable variant) increases the amount of Geo enemies drop.

Keeping Relics to sell to Relic Seeker Lemm when Geo is needed is particularly useful because, unlike Geo, these items are not lost upon death.

A great early source of Geo is the Husk Guards in the Forgotten Crossroads. Many enemies in the City of Tears, especially Great Husk Sentries, as well as Hoppers and Great Hoppers in Kingdom's Edge, are also great sources of Geo.

The fastest ways to farm Geo later in the game are to continuously complete the Trial of the Conqueror or to farm Dirtcarvers and Carver Hatchers in the Failed Tramway with Fragile Greed/ Unbreakable Greed equipped.

One-time Major Sources
 * The Gorgeous Husk in the City of Tears drops upon death ( with Fragile Greed equipped)
 * In Kingdom's Edge, there is a hidden passage accessible by breaking a wall in a room with a Great Hopper and a lot of spike pits. At the very bottom of it is the largest Geo deposit in the game, rewarding . This value is not increased by Fragile Greed.
 * Millibelle the Thief returns roughly 1.5x what is deposited in her shell, when in the Pleasure House. See Millibelle for more details on this process.



Trivia

 * The maximum capacity for Geo is 9,999,999.

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