I recently won agaisnt a 200O points dwarf army with Thorgrim. I won because I got lucky. After killing a TK and a TP he failed one of the two leaderhship test and received six wounds.

Since I will face Thorgrim a lot in the near future and I will not always be that lucky, I was wandering if a TK with the DoE will do 10 automatics impacts on him or just two.

The extra two are obviously 2 for each dwarf under the throne.

As silly as it sounds, unless the guys under him are classed as seperate models then he would only take the 2 hits. if they were seperate guys, he would still only get hit 2 times and then each other guy would take 2 hits as well, so the most you'll be able to do will be 2 hits on him, unless he has some special rule i dont know about...

Agreed. In order to be able to attack a model, it must have separated stats.
For example, if you attack a stegadon, you can not kill the skinks because they do not have separated stats.

On the other hand, if you attack a casket of souls, you would allocate attacks to each guard and the liche because they have a full statline for themselves.

Does this make any sence?

Against Thorgrim I think you only get two hits because I don't think the dwarfs under the throne have a set of wounds, if they do then you can hit them.

PS sinks on the Steg do have a stat line.

WelL the bearers don`t have a complete stats line, tey are missing T, W and LD, it seems they are like steeds or the members of a chariot unit.
So only two hits agaisnt Thorgrim.

What about the TK item thst negates arcane objects? Will that do any good against Thorgrim and his runes?

it would only remove his runic tailismans, nothing else, which would still allow him to kill your character without any trouble. The best tactic is to avoid the guy all together, kill the rest of the army and if you feel like it attack his unit from flanks and rear but not contacting him, and try to break the unit, not an easy task but easyer than killing him.