You can turn down the raid frequency in world modifiers - the same menu where you select the world you are playing

I honestly expected this thread to be the other way around.

In my 90+ hour singleplayer playthrough, I encountered a total of 6 raids at my base, plus 3 wolf raids. So far in my 30+ hour game with friends, we've encountered a grand total of 4 raids. So basically we're looking at 1 raid every 10 hours. That's so incredibly low that you tend to forget they even exist.

And when they do happen they tend to be extremely easy to deal with. The only time I ever actually struggled with a raid was when one triggered immediately after I just died, so I didn't have any gear or even food buffs vs Trolls. I still don't think they managed to kill me. Theoretically you could get something like a wolf raid within minutes of entering the mountains, or a charred skeleton raid just as you are setting up your ashlands outpost and in the middle of fighting off the endless horde already, but raids are so rare that it just doesn't seem to happen like that.

Note that this isn't too dissimilar to the OP's experience. 40 game days = 20 hours, so while 5 raids is about double the frequency it's also happening during his most dense "stay at home" time in his playthrough. Most raids only happen while someone is "at home", so it's likely this is the most raids he will ever see.

You can disable raids in the World Modifier. You can reactivate the raid option when you are ready.

It is random whether a raid is triggered. The game does a check (dice roll) at regular intervals to see if a raid is triggered. From memory, previous posts said the check is done once every 2 in game days. It sounds like you were very lucky (or unlucky depending on your point of view).

You can also fight from a raised earth platform with a stagbreaker or similar weapon. I usually put a raised platform at each corner of my wall. You just need to have a place to retreat to if the ranged enemy units do too much damage.

Originally posted by Vortex:

Does anybody have any advice besides finishing the wall? Or any advice for future playthroughs?

Spam player base pieces in the renderred zones.
Buried campfires or wood torches would suffice for land raids.

Originally posted by Thornwood:

You can disable raids in the World Modifier. You can reactivate the raid option when you are ready.

It is random whether a raid is triggered. The game does a check (dice roll) at regular intervals to see if a raid is triggered. From memory, previous posts said the check is done once every 2 in game days. It sounds like you were very lucky (or unlucky depending on your point of view).

You can also fight from a raised earth platform with a stagbreaker or similar weapon. I usually put a raised platform at each corner of my wall. You just need to have a place to retreat to if the ranged enemy units do too much damage.

There is a chance for a raid once every 40 IRL minutes. A game day is 21 minutes long and game night is 9 minutes. You can skip the night by sleeping but doing so does not affect the raid check times.

@OP you can cheese the raid mechanics by having more than one base usable as a main base. The raid timer only progresses when a player is inside the raid circle. There can only be one active (or paused) raid in the world at one time. So use your main/first base until a raid starts and leave the base via portal to your new location. The raid at your first base pauses and so can cause no damage. While the raid is paused at your first base you can take time to work on the defenses of the 2nd base until the random roll causes the first raid to disappear and the new raid to start at your new base. Immediately portalling out to the first base will cause the raid at the 2nd base to pause and you can operate out of your first base until the next raid occurs at which time you can switch and build defenses at your new base again.

Repeat until you have earthen walls and pits at the entrances built in both bases and then you can ignore the base raids that have no flying creatures in them.

Just dig a trench around your base - you can do it at any stage and it will be good until planes biom. Takes few minutes (dig deep - until max depth, but only 1 wide) and you are safe from everything close combat. Earth wall (6-8 hight) will keep you safe even in Ashlands. Also - you can run away and wait raid out. THough no place at Odins table for you.

Originally posted by Avetembi:

You can turn down the raid frequency in world modifiers - the same menu where you select the world you are playing

Theres also a devcommand for it that can change it far more than the world modifier bar can. I don't remember the command though. When I say far more, I mean, anywhere from almost never, to a new raid every second. And yes, they stack.

I'm actually not joking, around 10 in-game days after this post another swamp raid started. But this time I have a wall. The walls worked fine besides some skeletons in the back.

At least they're not as frequent as Raid mobile game ads.

It just happened again

Originally posted by Vortex:

It just happened again

Guess you'll be making a lot of sausages and bone bolts.

But seriously. Settings to manually adjust raid frequency to your liking already exist. Adjust them on your custom modifiers; coming here to grouse about it isn't gonna get you anywhere. RNG is RNG.

A tip to survive raids, the raid will only spawn a set number of enemies, so you can just get aggro from all the enemies and run away, or get to a safe spot until the raid is over and then pick off the ones left.

Originally posted by Exodite-Dragon:

Originally posted by Vortex:

It just happened again

Guess you'll be making a lot of sausages and bone bolts.

But seriously. Settings to manually adjust raid frequency to your liking already exist. Adjust them on your custom modifiers; coming here to grouse about it isn't gonna get you anywhere. RNG is RNG.

Well it hasn't happened any more so I think the weird coincidence is over now.

It is completely random. I had raids happening like every in-game day for a while, and of course just right around nightfall, when my tired viking was in his pj's and about to hit the bed.

Originally posted by electricdawn:

It is completely random. I had raids happening like every in-game day for a while, and of course just right around nightfall, when my tired viking was in his pj's and about to hit the bed.

Well honestly its not "completely" random Valheim uses a PRNG (pseudo random number generator) which does not create perfect random numbers. One of the flaws of PRNGs is the less sophisticated ones can often generate strings of numbers that are outside the math of true random numbers.

TRNG generators have been commercially available since 2017. They use real world phenomena:
electrical noise;
free-running oscillators;
chaos;
quantum effects. (like muons from cosmic rays).

but these are expensive. The better a PRNG program is the more expensive it is. Indie developers often use less complex PRNG programs to save money. Most average users never notice a difference.