Act4 and following will be just like in the BEST-Ending Guide with only minor Exceptions:
After Axel learns of the Sabotage, you can (and should) convince Thane to move to the Tavern. You can chat with him. After some time, both tribes will start to prepare festivities. Speak with both Chieftains and their Shopowners in the village. If you got trouble to follow the Kratos, look at the picture of my Best-Ending guide above. After you defeated the Kratos, you got another choice to make [Make another Important Savestate if you like]: Bring the Fruits to the Bull Tribe. This is necassary to prvent the Excution of the Lizard Prisoners at the next morning.
If you don't care about the Lizards Prisoners, this is your last chance to bring the Food to the Lizards Tribe and enjoy the Nauxus Romance. I do not recommend that.
After Thane is wounded, it is very important, that Eyvind walks to the Bull Village at the next morning right away!! If you take too long, Axel will execute the Lizards in your absence. If you gave the Food to the Lizard Tribe, Eyvind will always be too late to intervene, even if Axel's Suspicion-Score is =< 3.
Next time you sleep at the tavern over Night (Bath is recommended to boost your HP/MP) the battle at the Tavern will break out.
If Thane is at the Tavern, you will gain the bloody/torn Cloth from him at the Tavern.
Once you recieved the torn Cloth and the last Quest, go to the temple and meet the Dragon in the Paintings. Follow the Guide above or Red-Yoshis Guide to make Peace between both Tribes. You need two (2) Emblems to meet the Dragon. The torn Cloth is need to trigger the Dragon's thrid cutscene with a painting about Thane. [ Little Secret: It is possible to NOT ruin the Dragon's Painting. Just stay hidden and do NOT call Thane.] After the Scene a hidden Location is reaveld on the Map. To find out about the Steps in Detail and the hidden Location of the next Boss, look the guide above.
The concludes the Thane "No-Casualty" - Route.
From here i recommend to get Honey from Snow asap. Use the Honey to cook a meal for Bread. I also recommend to finish Thane's Hell Kitchen Quest. While Perith is gone, use the time to grind a few Levels and Money. Make sure that you got eight (8) in INT before befriending Rasmus. and at least ten (10) in Agility to impress the old Fox. The Lizards Talisman help. You could also try to equip the Loincloth and drop the Wintercloth to "cheat" another point of Agility.
Good Luck.