1.
Nobles and Mules are both 1-slot pets with different merits.
Noble Steeds - Pack Instinct, insane run speed, energy breath (scales with current HP like dragon breath).
Mules - Poison Immune, non-Pack Instinct, have backpacks, have Magery.
Defensively, they are the same when maxed, aside from the fact that mules cannot be poisoned (mostly irrelevant with the fact that Cleric heals ignore poison status and 99% of poisons deal negligible damage, but still, a definite bonus).
Offensively, I cannot say because I only run with Noble Steeds. Just to give you a general idea, a balron in Discordance will take around
3-10 seconds to die with 5 Noble Steeds wailing on it. The variance is due to the fact that enemy stats can vary and nobles have to decide to use energy breath, just like mules have to decide to cast a certain spell. On the other hand Nobles can always use their energy breath regardless of mana, it's an innate ability. On a long fight, mules will run out of mana.
Mules have a
significant benefit on any fight where you are not purely focusing on one target though - pack instinct creatures only get their damage bonus if they are hitting the same target. So on encounters where your pets will be split up for much of the time (eg. champion spawns) mules will be dealing their regular damage as always, but nobles will be dealing half their normal damage.
As for the price difference, this is due to a flaw in the pet leveling/breeding system.
Pack Instinct pets have a low str/dex/int cap due to the pack instinct stacking damage bonus, non-Pack Instinct pets have much higher caps for those stats.
Caster pets have a requirement for int and mana, melee pets do not.
> Nobles are pack instinct melee pets
> Mules are non pack instinct caster pets
You can see, therefore, that mules are
a lot harder to breed up to maximum stats. It takes much more time, effort, and luck. This is why they cost so much more, and are also so much harder to find fully maxed out.
2.
Slower, biopets are tank-type pets (and they do that job admirably). They take 3 slots as well. If you're going for sheer DPS/kill speed there are much better alternatives.
3.
The most commonly used weapon here is the yumi, a type of bow, since there is no skill cap and nearly everyone runs with a tamer hybrid. A bow allows you to deal damage from 10 tiles range, weaving shots in between your healing spell casts. There is no risk that the boss will run at you and begin attacking you and you have a buffer between you and the enemy that you can withdraw or cycle your pets around as required.
Spell channeling can be added for 100 ED (3 million gold) with a deed. This also has no -1 FC malus.
You do NOT want spell channeling as a default stat on your weapon (unless it's an artifact) since a no-FC-malus SC will actually cost you 2 attribute slots out of your precious 6.
Additionally the most important spells (cleric heals and paladin damagebuffs) will not require SC. Therefore you can largely ignore the absence of spell channeling on your weapon.
Try this very recent post of mine, it may be a little dull to read but it gives the general idea of what to look for in a base weapon:
http://www.uoex.net/forum/viewtopic.php ... 456#p11456
You cannot add Spell Channeling via the leveled weapon system. Slayer properties are also out of bounds.
What you can add in the order they are in the list:
Melee Attributes -
Defense Chance Increase (3SP)
Hit Chance Increase (3SP)
Damage Increase (4SP)
Swing Speed Increase (4SP)
Reflect Physical Damage (3SP)
Magic Attributes -
Spell Damage (2SP)
Faster Cast Recovery (5SP)
Faster Casting (50SP)
Lower Mana Cost (5SP)
Lower Reagent Cost (5SP)
Enhance Potions (2SP)
Mage Weapon (1SP - used to REMOVE the -XX mage weapon penalty, not add it)
Character Stats -
Regen Hits (2SP)
Regen Stamina (1SP)
Regen Mana (6SP)
Bonus Strength (4SP)
Bonus Dex (4SP)
Bonus Int (4SP)
Bonus Hits (3SP)
Bonus Stamina (3SP)
Bonus Mana (3SP)
Lower Stat Requirement (2SP)
Resistances -
Resist Physical Bonus (5SP)
Resist Fire Bonus (5SP)
Resist Cold Bonus (5SP)
Resist Poison Bonus (5SP)
Resist Energy Bonus (5SP)
Weapon Hits -
Hit Life Leech (3SP)
Hit Stamina Leech (3SP)
Hit Mana Leech (3SP)
Hit Lower Attack (3SP)
Hit Lower Defense (3SP)
Hit Magic Arrow (4SP)
Hit Harm (4SP)
Hit Fireball (4SP)
Hit Lightning (4SP)
Hit Dispel (4SP)
Hit Cold Area (4SP)
Hit Fire Area (4SP)
Hit Poison Area (4SP)
Hit Energy Area (4SP)
Hit Physical Area (4SP)
Misc. Attributes -
Luck (3SP)
Nightsight (10SP)
Self Repair (12SP)
Use Best Weapon Skill (50SP)
Durability Bonus (1SP)
4.
Codex -> Player Services -> Miscellaneous. It costs 50,000 tokens.