It ain't too pretty...and I use the term "guide" rather loosely here.
There are several very good guides out there about raising resist that are faster, and easier to accomplish. And they're also much more expensive,
They all seem to require an established gameplay setup though, multiple characters and/or accounts, etc...and a lot of gold [regs]...
This ain't one of those....this is a very simple CHEAP guide for using Wisps in a house, specifically for newer players [like me!] who don't have the ability or desire to follow the other guides...me, I'm just cheap I'll spend my first 50k on a small house rather than regs...Wisps are free!
*Note: Raising Resist to GM in this fashion does get very slow up above the 80's due to the ratio of damage required [# of Wisps casting] to the ability to heal that damage [solo healing]. A newbie character on a 2nd account with 50 Healing/49 Anat, positioned correctly and macroed to heal you, can help negate this somewhat [fail alot], and can be rather entertaining
*Note: you can do this inside the house with a couple tables and the mount, ducking out the door when needed, it's just easier doing it outside as shown. Wisps will break anything you try to block them in with, but, being non-aggressive by nature they won't attack blue creatures/humans, unless attacked. The mount, being blue, is able to block a wisp, even when attacked* No doubt there is a way to lockdown something inside to block their LOS...anybody?
The only real requirements are a house,, mount, or pet, GM Healing [or close to it!] and bandages. Oh...and 1 or more Wisps.
[cure/Heal pots are optional and speed the process up, but this is a CHEAP guide so...]
This guide does assume that your character has 100str and started with 50 resist or has worked it up there at this point. Mine was at about 63 when I started, using 3 Wisps.
Briefly, how it works...
Obviously, the mount blocks the Wisp[s] from reaching you. 1 Wisp can cast across the door tile, as well as the tile next to the door [along the edge of the door]. Spot x2 is the 'sweet spot', Only use spot x3 when things slow down. With multiple Wisps you simply take damage too quickly on spot x3 to negate it, and you will drain the Wisps of mana, requiring a break.
On spot x2, with 3 Wisps, they will move in a constant circle, trading positions as they try to reach you. One will always be in the corner tile directly behind the house sign and unable to cast, so they regen mana while here then eventually cycle out to a casting tile again and another takes its place. At any given time you will only have 2 Wisps casting and 1 regen'ing Mana. I've never had them run out of Mana in this manner.
Keep in mind, due to debuffs, you will only be working with 91str most of the time.
It ain't pretty but it is cheap and effective...
Feel free to point out where i'm wrong, or lacking...this is just how I do it! Hope it helps someone