What can i do against these mobs?

Everytime my way crosses these mobs i die, when im not carefully as hell. I feel very tanky all over every content, but these mobs are insane. What can i do to survive them?
In this video i was surprised and didnt react
https://youtu.be/De2_2A51FVI

Pretty sure this is the correct attack, and it is:

Spell
Lightning damage
Applies shock


So,

Cap lightning resist
Spell suppression or spell block
Ailment immunity

https://poedb.tw/us/Eldritch_Spawn

The mobs are called grotesque mauler. They use an attack and deal no spell damage.
At the moment i have 51000 Armor, a bit flat phys reduction, 7 endurance charges, 85% max ele resistance, capped chaos resistance, 44% block chance for attacks, 90% reduced dmg from crit and the shock effect is also reduced. In the video im not shocked.
Im not sure how i can deal with these mobs. Its the first time that i play a character that tries to reduce dmg instead of avoid it. It works pretty well, but when these mobs appear then this in the video happens. Normally i have time to dodge, but this time i was really suprised.

(Edit: I think you have the wrong mob type, there are multiple mobs there and I think you are mousing over a different name.

I think this is the one getting you. Its an eldritch version of the "titty" mobs from act 3 lunaris on the way to Piety.
https://poedb.tw/us/Consuming_Thrall

Would make sense that it is spell damage getting you rather than attack damage, because you do actually have a reasonable amount of block. So as previous poster mention, it may be rapid hitting lightning projectile spell damage.

You could try tempest shield, but if you can't fit it in or get spell suppression you might need to try something like the other options mentioned below. Replica rumis is also pretty good given your Jugg with unstoppable, I'd prob try that if I was you.)

Depending on your build these can be dangerous or harmless. I think you are right that it is attack damage, you can block some of it with your shield, but probably a lot is getting through, at least on the times you are dying. This can be a vulnerability for armour builds in the bottom left of the tree, because they often don't have evasion or much block. Same as with rapidly hitting spell damage.

Having your molten shell on CWDT instead of automation probably would of saved you there, it was up and wore off when you proc'd the alter. You probably would of had more time to react if it was up. Whether you want to change that just for these mobs is a different question. You also have a elemental weakness depuff on you, not sure if that is affecting you, but if like other poster is saying it is lighting damage, this might be making things worse.

Options for dealing with this other than evasion/ block, something like defiance of destiny is great, because you are gaining life for every time you are hit. May not be available to you or fit with your build, but something like that or more block, sure there are other solutions someone can suggest.

Another option might be running exarch instead of eater if you dont need it, as that mob only spawns on the eater maps.

This is one case where skill beats defenses. A key thing to note about that mob is that there is a fairly long pause from neutral to attacking and back to neutral. Turn speed is also awful. If you circle strafe (like in FPS games), it basically can't hit you. I play eater influence all the time with a glass cannon and very rarely die to this mob.

Basically, every time you click an eater altar, expect to see that unit. Whenever that expectation is right, just circle strafe, then kill them while they are stuck in the attack animation hitting your previous location.

Normally i can manage the mobs, but sometimes they suprise me. At this moment i didnt expected the mobs to spawn. Maybe my mind was a little bit in idle mode, because i played some hours without any problems.

Dont know if i can pick more defense. I would need to sacrifice some damage, but my damage is not that awesome. I can do everything, but only because im not a glascanon. Fights maybe take a bit longer.

I dodge them manually when i see them, but the burst damage was so fast, that i didnt had any time to rescue me.

Dont know if elemental weakness was a problem. I have enough resistance and my flask reduces the curse effect.

The thing with molten shell and Cwdt could be a solution, gonna try it.

Yeah you are overcapped on you res so it might not of been doing much, although your lightning res is only slightly overcapped, so if you were down from 85 to say 70, that's doubling the lightning damage you take. I'm assuming this is happening when you don't have the curse as well, but next time you run a map with that mod, check your character sheet and see if the are getting low.

Yeah it might help, might be worse in some other situations, probably worth trying though. I'm still thinking replica rumis concoction would be good there if you remember to push it when proccing the alter, or even the regular version. A bit annoying though trying to find a way of having it active when needed. There's also a flask mod % of damage taken leeched as life, I'm wondering if that would of given a small amount of recovery in that short time and given you time to react. Pretty quick though, probably have to do what temjin said and anticipate the sidestep.