1) What is a -50 offhand?
There is a focus item from the “cities of Ascalon” quest given as a reward,
which gives -50 health, this is common for a 105/55 build.

2) What’s a 105/55 build?
This is a Mo/W build designed to bring health very low, to 105 or 55, by using
five superior runes and a -50 offhand.  The trick is, to use protective bond so
you only take 2 [or 5] damage from any attack.  This way, a +4 mending can more
or less keep you alive forever while you smite the hell out of anything.  This
is a common farming build, though any enchantment buster will cream it.

Patch Note: This build is now virtually a thing of the past, it requires
thinking now to make it work.  Do not email me about this.  Basically, you
will be using protective spirit now.

3) Is 15k armor better than the 1.5k armors?
Nope, just looks nicer.

4) What about fissure armor?  How much does it cost?
Fissure armor is no better than Droknar’s armor, it just looks MUCH better.
The secondary ingredients are the ingredients for the 15k armor in the grotto
and citadel.  The primaries are Globs of Ectoplasm and for most, obsidian
shards.  The chest takes 45, pants 30, hands, head and feet 15 each.  Bringing
you to 105/120 ectos/shards.  Ectoplasm and Shards only fall in the underworld
and fissure respectively… with a few rare exceptions.

5) What skills do henchmen use?  Where do they appear at?  How do I make them
function better?

Henchmen are found in every town in post-searing, often near the door.  Stefan,
Reyna, Alesia, and Orion are the only four you can choose from, until you reach
Yak’s Bend.  At that point, you can choose from Dunham, Claude and Little Thom
as well.  You’ll be able to use Lina once you reach the Amnoon Oasis.  Mhenlo,
Cynn, Eve, Devona and Aidan replace Stefan, Alesia, Orion, Reyna and Claude
once you reach Thunderhead Keep.

Henchmen use the following skills [Thanks to ShadowZone for posting this]

Stefan
Healing signet
Griffon’s Sweep
Sprint (lvl 3-17, switches to charge at 20)
Resurrection Signet
Power Attack
Balanced Stance
“Charge!” (lvl 20 only)

Orion/Cynn
Fire Storm
Incendiary bonds (lvl 8-20 only)
Aura of restoration
Mind burn (lvl 20 only)
Fireball
Fire attunement
Resurrection signet

Alesia/Mhenlo
Orison of healing
Heal other (lvl 8-17 only, switches to word of healing)
Healing touch (lvl 15-20 only)
Healing breeze
Word of healing (lvl 20 only)
Restore life

Reyna/Aidan
Kindle Arrows
Dual shot
Resurrection signet
Power Shot
Troll Unguent
Practiced Stance (lvl 20 only)

Dunham
Imagined burden (lvl 8-17 only, switches to crippling anguish at lvl 20)
Shatter hex
Crippling anguish (lvl 20 only)
Drain enchantment
Empathy
Distortion
Resurrection signet

Little Thom
Healing Signet
Executioner’s strike
Resurrection signet
Wild Blow
Sprint (lvl 8-17 only, switches to charge at lvl 20)
Swift chop
“Charge!” (lvl 20 only)

Claude/Eve
Shadow Strike
Deathly Swarm
Resurrection Signet
Vampiric Gaze
Blood Ritual
Grenth’s balance (lvl 20 only)

Lina
Aegis
Shield Hands (lvl 17 only)
Protective Spirit
Shield of Regeneration (lvl 20 only)
Restore Life
Reversal of Fortune

Devona
Mighty blow
Counter Blow
Resurrection Signet
Healing Signet
Irresistible Blow
“Charge!”

Henchmen will not attack anything unless they are attacked or you attack it
first.  They will attack a target if you call it and at least move towards it
as though you are going to attack.  Because they will try to attack things
attacking them, they are difficult to run through areas with, because they
will constantly stop to swing at something, before trying to run again, which
often gets them stuck.

Henchmen will use a resurrection signet if no one in the party has a res spell.
In my own personal experience, Reyna has the best survival ability, and Alesia
dies quite quickly, as does Orion.  Lina is probably the most useful of them,
as she can keep people alive for a good while with her spells.

Henchmen take drops and split gold as well as experience, thus, the more you
bring along, the less loot you will get.  Henchmen can not enter the Underworld
or Fissure of Woe.