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The idea is to idle everything but the Cataclysm attack of Ragnar. Use Can I Idle to check if you can do it. You want to be able to tank everything else to reduce the chance of death.
The spell of choice is either 20k-accuracy Slicing Winds or Gust if you unlocked it. With them, you don't have to worry about the long fights because they won't miss.
Having Finn, the Cat does not make a difference for the following, coincidentally, and thus could replace the need for the last HP level.
Extra DR
An Earth Layered Shield (ELS) is better than a Dragonfire Shield (DFS), but is arguably harder to get. The ELS requires a total of 64% DR, the DFS requires a total of 62% DR.
Note that the ELS gives 4% extra DR by itself, effectively reducing the extra requirement.
You can get up to 1100 hp through agility, reducing the total dr% requirement with Wasteful Ring to 56% (the -2% dr one is not worth it). Without Wasteful Ring, get it up to 1120 HP at the cost of two DR%, and you will only need 64% dr.
At 1000 HP, and without Wasteful Ring, you would need 71% DR.
At 1030 HP, and without Wasteful Ring, you would need 70% DR.