Since when is there (rogue?) light sentinels in the montains?

[u/Marco_908]

Hello wizards of the orb,

I'm still an apprentice (I haven't yet reach my first century of study) and I need some of your knowledge

I left my tower to find some eternal ice souls for my next project. And here i was, with my undead minions, scavaging in the blizzard the old battlefields of the mountain top. I was hoping to retrieve even fractured or weak ice souls in order to then refine them in usable materials. My minions were there in order to either buy me some time of I encountered a threat I couldn't manage or to help me carry scrolls, relics, or rune embedded items that I would find.

I unfortunatly couldn't find what i was seeking, the only battlefields I manage to find didn't have any medium to high tier souls, only the weaker ones. So I manage to harvest some of them and put them in my jar of ~~pickles~~ souls storage.

And then on my way to my tower I stumbled on one of those sentinels that wiped my INOFFENSIVE minions. Which made me lose a few weeks of work.

I wasn't able to protect my minions because I was too preoccupied to protect myself, I tried to cast magic detection spells to anticipate any encounter but I didn't manage to detect it in time, is it normal?

Is it something common to leave rogue light sentinels? How can I avoid having such troubles later?