ToME: the Tales of Maj'Eyal

I'm playing a Nightmare game right now with the Turtles Addon and I've come across a boss in Turtlemire that would seem to be unbeatable, at least for my character. I was hoping that perhaps I could get some advice as to how I might be able to beat it. I've uploaded screenshots of my sheet & the boss': https://imgur.com/a/EMCzu

Thanks.

Resistance Penetration/Reduction.

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A little bit of a starters guide written by yours truly here.

What's the best way to get those?

Gear.

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A little bit of a starters guide written by yours truly here.

Attack him with non physical damage types too if you can

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MADNESS rocks

I don't think that will help, since the boss has 100% all resistance.

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A little bit of a starters guide written by yours truly here.

Is there any location that drops that sort of gear more then others?

No.
You are not going to get any specific instructions because none are possible.

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My feedback meter decays into coding. Give me feedback and I make mods.

Why not? Would an item with Resist All penetration (as suggested by MicBran) not help?

I remember at least one item that has this modifier; it was a pair of gauntlets from the Ashes of Urh'Rok expansion.

edit: in theory you could also kill any monster with the Staff of Absorbtion, right through 500% Resist All or whatever.
Any sort of Instant Kill ability is also a great help, like Eksatin's Ultimatum.

All res doesn't matter, it gets calculated directly into the respective resistances, so having resistance penetration for the relevant element is all you need

Resall penetration shows up on lites and like 2 fixedarts only, specific resist penetration is mostly on fixedarts and as an additional property of rare or randart items so it's fairly difficult to itemise for especially in early game.

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<Shibari> You're full of shit
<darkgod #tome> ster is a troll
<Sheila> and ster, i do agree with you on most things game-related, but do try to not be such an ass!
<mex> your posts lead to people like me being abused and murdered

Also, some classes get talents that improve resistance penetration for some element that they use, but not all classes have such a talent.

Also, what drugs is the creator of that addon on?

IIRC it was because StarKeep wanted a difficult final boss at the end of his level 50 zone and thus, that turtle was born.

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A little bit of a starters guide written by yours truly here.