This is a farming guide for those who want to know how to farm gold. Please do make any suggestions that I haven't put in the guide.
This guide was created by Deebaws at http://celtic-heroes.com/forum/viewtopic.php?f=51&t=63674, and reposted here by his request.
First off, I recommend you not farming until level 70 as you will simply not have the stats or the gear to kill the mobs effectively enough to gain gold. So if you are below this level, then I recommend you leveling up a bit more.
It all varies on gear and level but you should expect to make a few thousands per hour. You may get lucky and get a drop such as Gold doubloon which sells for 1500 gold maximum per drop. Also varies on classes which druids are weakest class to farm since high energy cost and most fragile with also risk of skills getting missed while rogues are best due to fast killing and are able to effectively survive mobs thanks to their defence.
Skills needed:
ROGUES:
Riposte - best farming skill, this is a skill that you cast on yourself and it does high damage for a few seconds. To make most of this, gather a few mobs and set off riposte. I recommend maxing it as it's good for leveling.
Life steal - you gain health while dealing some damage to mob. Wouldn't say it's necessary but it helps a lot. If your lower level and don't have this than I would stick with bandage wounds
Quickstrike - it's good if you want to kill 3* and 4* quicker but not necessary
Shadowstrike - same as Quickstrike but let's you teleport to mob and it hhas poison damage which is unresisted on almost every mob. Not necessary but it helps.
WARRIOR:

Protective stance - protects you from high damage
Sweeping blow - attacks multiple mobs at once
Rupture - damage over time skill which can help against any 3* or 4* if you can't kill them quick
Giant swing - high but quite slow cast. It helps to kill 3* and 4*
RANGERS:

Light heal - to heal yourself after taking damage
Explosive shot - damage more then one mob at a time
Rapid shot - makes your auto attacks faster
Steady aim - boosts your damage and attack which will allow for faster killing and doesn't require constant recast
Sharpen weapons - adds to auto attack damage
MAGE:

Fire bolt - fast cast high damage, aids to kill mobs still standing after firestorm
Fire attune - boosts the damage of fire storm and fire bolt
Energy shield - stops you taking damage for a period time or certain damage. This however will use up a lot of energy
E-Boost - only recommended for those who DONT have regen lux. This will regen your energy even in combat.
DRUIDS:

Nature touch - heals yourself after taking damage
Lightning strike - fast cast high damage skill
Shield bark - increases armor so you take less auto damage. This does not protect against elemental damage though.
Embrace - heals over time so you can have it ticking while mobs are attacking.
Areas to Farm
Optional Areas
Recommendations
Luxury Shops
- Quigley the Merchant (Level 1)
- The Scavenger (Level 50)
- Cabry the Squire (Level 100)
- Lord Ealdwin (Level 150)
- Quartermaster Lief (Level 180)
- Quartermaster Dorian (Level 200)

Regeneration items - Get braclets or the amulet. This saves you from using meditate that takes up your farming time. I don't recommend the ring as it takes up a ring slot and that 5 regeneration is small. Some offhands provide regen as well as some of event lux items that provides plenty in combat energy and health but they are expensive. (Click here for the guide to regeneration)
Skill rings - riposte is preferred but lifesteal and max reflexes can work. You can get riposte rings from the fingal mobs. Skills like rupture, pummel, giant swing, protective stance will work for warriors. Druids could use stinging swarm skills if they are going to farm but could use self support skills like bark, nature touch, embrace etc to help them survive better. Mages can use attune skills to boost their skills as well as firebolt, Ice shards and firestorm skill to kill faster. Energy shield can also be used but it will use up a lot of energy. (Click here for the guide to skill ring/book locations)
Sigils - regen either health or energy depending type you get. Regen out of combat only, it'so useful as you don't need bandage wounds or life steal the next mob if you get health. Energy sigils can help if you in fingal running which while running you can regain your energy instead of standing for meditate to tick which is a waste of points at higher levels. Caster classes will require more energy sigils then health since they utilise spells heavier. Having many sigils for all classes makes a big difference as it is very time consuming to sit and refill your health and energy with just meditate, recuperate and bandage wounds.
Stats - There isn't really a build dedicated to farming. Just your normal leveling build will be good at farming but you may want some health to survive attacks and defence to dodge.
Example I would give for level 70 rogue no lux is that you have 350 stat points so maybe something like 100 str, 80 Dex, 30 focus and rest vit. But if you feel you leveling fine and can kill lower mobs effectively then stick with your current build. Warriors may follow similar build with less Dex and more vit while mage and druids at this level may follow a 3:2 focus to VIT ratio as STR and Dex aren't useful for them.
Gear - if you can, then get the quest line armor and avoid shop ones except maybe the flint weapon but meteoric is better for rogues than the otherworld shop ones and should last you until frozen or bone weapon. Shop armor provides stat bonuses which for rogue it is DEX and STR increasing their skills and some auto attack damage. For warriors it is STR and VIT which both can contribute to their skills. Druids and mages have FOCUS and VIT which will boost their skills while providing some more health. It should be noted that shop armor is better for mages and druids then the questline but there is option for duskshadow question which you will need to gather items to turn in for pieces of armor that provides focus and evasions.
If not in a clan, then I recommend you could either buy the discs for warden or buy some quartz gear but not flint as it's a waste for small bonus and weaker than warden. Warden has a nice aura bonus and that it will help you cast more skills and the health bonus helps. If your not in a clan than I recommend you to for leveling purpose soon and that the fact they make game fun!
Any gear above warden will work perfectly and need no explanation.
Best place to sell drops - Otherworld scavenger provides the highest amount of gold but require 25,000 gold but there are some merchants that can be used instead. I noticed weapons sell more at weapon vendor than lux vendors. If you don't have 20,000 gold then you can go to blacksmith in Farcrag castle who will give you same amount as lux shop with no minimum gold requirement(Thanks Friddoo). There is also Skill vendor that gives equal to otherworld scavenger and it is accessible to all levels (Thanks Reecelad) and the stonevale weapon merchant that also gives equal to otherworld scavenger(Thanks Offiues)
(Note: Click here to see the guide on the best place to sell items)
Hope this helps