I've played GF2 as a Shaper, ie.creations and healing, on normal. Now I am Lvl25with intelligence,endurance, healing and mechanics as my main investments..

I've got now 75% of the map cleared, however the remaining parts and some special locations remain well-defended by "boss"-type monsters or pylons, against which all of my creatures except one have 0% hit chance, and the one who can hit has just 15% with war blessings active. That one creature has dexterity maxed by spending skillpoints and is lvl 25.

Is my only hope to turn down the difficulty, or do you have special moves that could help?
Maybe using wands and gems to cast at he enemy?

What kind of creations are you using? It's a good idea to swap out early creations for better types as you find them, rather than trying to power up the ones you have at the beginning. There's also a specific upgrade (i.e. better version) for each creation that you can find, and those upgraded versions are much more powerful than the base creations.

I haven't played for a long time, but I think that near the end of the game I was mostly using Drayks and maybe also some Gazers, but I was also playing as a Guardian so I didn't have that many creations. If you don't have those creations yet, mess around with Thahds and / or Battle Alphas, and mix in some of the magic creations too, like Vlish and Glahks.

If you're already using those creations and you're still having trouble, we might need more information about which bosses you're trying to kill, more detail on your character build, etc.

I did quite the opposite, I still have two fyoras from the beginning, one 25 llvl one 20. I could swop them out for searing artilas,but I'm scared of getting new units that are low on HP.

I also have two thads of level 21 and 20.I have no trouble keeping them alive by healing as they have lotsof hitpoints.I could swop them out for thahd shades, but their description says their attack is the same, only defense is better.

I have visitied all but taker territory and some locations guarded for example by a guard drakon.
So i guess my main problem are the pylons to the left that block access to taker territoryin the north, and the gazer. in the middle north, which guards the acess to the takers in the west.

I think i might get the gazer, if i try like 4 times a 30-minute battle, now that I have read in this forum that strength also increases to hit chance, but Im still looking for a less tedious way.

I never really tried keeping creations for that long, but everything I've heard is that it isn't worth it. Fyoras especially will be useless against tougher enemies (as you've found, they have 0% hit chance) and you'd do much better with some of the higher-tier creations. Get drayks if you can, they're really good.

Since you have leveled-up Thahds, don't bother with Battle Alphas, which are not as good as leveled-up Thahds (Battle Alphas are there for players who didn't keep a Thahd around, so they can start from a more powerful baseline).

I'm not sure how much better searing artilas will be at this point (you'd probably prefer a higher-tier creation), but why don't you save your game in a different slot and try them out? The higher-tier magic creations are worth a shot too, if you can make them.

Anyone else have advice? My memory on the game is fuzzy.

Well i'm seeing a glimmer of hope:

I scratched togerther 300 morexp by killing some golems, completing a quest, and delivering iron and shaper lba equipment.

With the new level ,I upped intelligence so I could invest in strenght for my favorite fyora.

Then i killed the gazer in a medium length battle.
Unfortunaletly the vlish that followed me around died in the battle, but it was too weak I guess.

I now have a key, and am excited to see what it unlocks.