Hey I'm a bit confused on nodes, I'm a wizard in the game I'm in and we left off on a node, when I got home I did some reading and it says "Power check against difficulty 10, modified by the relevant values for the advantages chosen from Table 18." I want to use high magic and since I have a power of 10 I only have to beat 10 plus 1 from the high magic, but I talked to the other guy in the group, he said that I had to beat against a 1d10 plus 11. I am very confused, I just read some things and I believe that it is a power check against a static number of 10 plus whatever.

No I believe you are correct, as far as I can tell the difficulty is static. Think about it this way: the book explains that tapping into nodes is highly dangerous, now if the difficulty was 1d10 + 1 that would mean the difficulty could be anywhere from 2-11. Now every single exxet book uses a roll up system NOT a roll under system. So if that was the case you add your 10 POW to whatever roll you get, which means you will get a score of 11 minimum... which means you have a 10% chance to not beat it... none of that sounds dangerous at all.

Now granted even with a static number you aren't really risking much in that example. However if for example you needed to cast a divine magic spell with half zeon cost in order to afford it, now it sounds very dangerous... where as if it was a D10 + modifiers you would still stand a good chance of beating it.