Mark_GGG

Player B did not gain an Endurance Charge, so cannot share one. They gained a Brutal Charge.

Player A, without the belt, has 0 maximum Brutal Charges, so cannot gain the charge B tried to share with them.

But if Player A gains an Endurance Charge and shares that with B, B will gain a Brutal Charge instead due to the belt's effect.

All characters innately have specific bonuses-per-charge for the three standard charge types, and the three "alternate" charge types they can be effectively replaced with by the unique belts. These can be seen in the character panel so long as you have the ability to have charges of that type.

Ok so the text of Supreme Grandstanding says that any charge is shared amongst allies

It says allies share their charges (of any type) with you, not the other way around. Sharing is not innately bidirectional. If entity A shares charges with entity B, that means when A gains a charge, B will also gain a charge. This requires that both of them can gain that kind of charge.

If B has 0 maximum charges of that type, B cannot gain the shared charge.

Charges are not buffs, and do not innately apply any bonus to players (or monsters). If B does not have any stats which give them something for having those charges, any such charges they gain will do nothing for them.

So if both players have Instruments of Zeal, then one of them could usefully share Fanatic Charges with the other.

The question asked in the title is very different to the one asked in the post.

The totem's stats do not change when your stats do, other than when the stat that's changing is one that specifically affects totems, such as "x% increased Totem Life".

That is irrelevant to the effect of the totem attacking/casting something, because the totem is not using it's stats for that. Totems do not have their own skills separate from you, they use your skills. If your stats change in a way that affects your skills, it affects your skills regardless of whether you or the totem uses the skill.

So this has nothing at all to do with how your stats change, it matters which of your stats change. Stats which affect your skills will affect them, stats which affect you specifically will not affect the totem.

Yes

No, modifying the resistance doesn't work, because the modifier setting it to zero will still do that. Penetration works because penetration doesn't change resistance values, it causes a hit to calculate as though resistance was lower than the actual value.

Otherwise is 0 is the same as inquisitors "ignore enemy elemental resistances".

This is not quite true - a resistance of 0 can be penetrated, an ignored resistance cannot.

This is all correct, but as an addendum to point 3, I'll point out also that modifiers to "elemental damage" or other modifiers that can apply to damage of multiple types don't apply more than once to converted damage.

Any given modifer in PoE either applies or doesn't, it never applies twice. If one thing is converted into another thing, any modifiers that apply to either or both of those things will apply to the converted value.

That's me (Mark Knewstubb) on the Hermit.

Yes it does, provided you cast the spell creating the cursed ground (as opposed to having a totem/trap/etc do it for you)

Brittle modifies the critical strike chance of hits against that enemy, it will be unable to modify them such that the cap is exceeded. Luckiness does not modify the chance value, it just rolls that value twice and pretends one of them didn't count.

Conditional modifiers like this can't apply do DoT in general, and even more so can't apply to "aura-like" area DoT like Infernal Legion - the effect the minion puts out has one value, it can't be different to some enemies in the area compared to others.