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[snpaa]

So far I've tried stone fall traps and cage traps and every single invader glides right past it.

Did toady nerf them or am I doing something wrong?

[PatrikLundell]

I've never seen a cage trap fail to capture things that are not trap avoiders (such as titans/FBs, were creatures, kobolds, and gremlins). Gremlins and kobolds can be cage trapped by stun traps from falls, while the bigger threats cannot, as they're stun immune. I use menacing spike traps on repeat for titans/FBs, while weres are to be detected by guard creatures to buy you time to close the drawbridges.

In addition to the above, the spies that go under the cover of diplomats will report back all traps discovered, and so those traps will be avoided if you get into a war with those parties.

Enemies can jump to reach a target quickly, and it's possible that might bypass a few traps, although I haven't seen that. My rather old attempts at stone fall traps caused me to conclude they weren't worth the trouble, since they resulted in minor injury at best.

[martinuzz]

I've never seen a cage trap fail to capture things that are not trap avoiders (such as titans/FBs, were creatures, kobolds, and gremlins). Gremlins and kobolds can be cage trapped by stun traps from falls, while the bigger threats cannot, as they're stun immune.

Those bigger threats can be captured by having a GCS web over the traps for you, unless they are webbers themselves (and thus webimmune). Bit tricky, with the risk of your own dwarves triggering webbed traps too.

[PatrikLundell]

True. All threats can also be killed by cave-ins. Atom smashing works on creatures that are not too large and are not in the Titan/FB category. I think casting in obsidian is lethal as well, but I don't want to try with a magma immune non breather to find out...

[Detros]

Could they have climbed walls around the trap?

[FantasticDorf]

I've never seen a cage trap fail to capture things that are not trap avoiders (such as titans/FBs, were creatures, kobolds, and gremlins). Gremlins and kobolds can be cage trapped by stun traps from falls, while the bigger threats cannot, as they're stun immune.

Those bigger threats can be captured by having a GCS web over the traps for you, unless they are webbers themselves (and thus webimmune). Bit tricky, with the risk of your own dwarves triggering webbed traps too.

But stunning a web and trap immune FB (unless they are stun-immune) will let you cage it however providing you could bait one under artificial support landing to be dropped on top of them or force cave in.

Meaning if the said web of the FB has any special properties, you can set up a production line to making special silk clothing (magma safe for instance if i recall hearing as one such desirable product) that can also be further dyed, embroided etc etc for high cost.

[Dozebôm Lolumzalìs]

Honestly, if you want to make a silk farm, you don't NEED it to be cage-trapped. Just use this:

FARM - ROOM - ROOM - Caverns

Where FARM is where the FB will need to stand, each room is simply an empty room, and the caverns are... the caverns. - represents a RAISING drawbridge.

In each room and the farm, put a bait animal or low-quality furniture. Then raise all the bridges and wait for a webbing FB to arrive.

When it does, lower the rightmost drawbridge. When it rushes in to kill/destroy the bait, raise the bridge again. Repeat for the second room, then for the farm. Now you have a webbing FB caught in a small room with a kitten corpse, ready for you to do whatever you want with it.

However, it is rather hard to make a FB silk farm, due to their [BUILDING_DESTROYER] tag. They will break down (non-artifact) doors, so you cannot use the trick used on GCS: (basically, they need a path to the bait to shoot webs, so you give them an unlocked but tightly-closed door. They will path through it, but cannot walk through it or destroy it, so their only choice is to shoot webs.)

But if you have an artifact door, either the farm will work, or the FB will spend all of its time futilely trying to knock down the door.

[FantasticDorf]

But if you have an artifact door, either the farm will work, or the FB will spend all of its time futilely trying to knock down the door.

As a suggestion, couldn't you make a wall out glass bridges so that the FB can maintain a constant line of sight with the kitten and therefore remain focused if you use the artifact door trick (alternatively engineer a way to implement glass windows without the FB having direct access to it via a moat/pit or something, so that the glass is separate but on the same level)

[Quietust]

As a suggestion, couldn't you make a wall out glass bridges so that the FB can maintain a constant line of sight with the kitten

Are you implying that glass bridges somehow do not block line-of-sight?

[greycat]

To expand on what Quietust is saying: line of sight depends on what type of construction is in the way, not what material it's made of.  A clear glass wall blocks sight just as effectively as an obsidian wall.

[Dozebôm Lolumzalìs]

In addition, the fb needs a path, NOT LOS.

[FantasticDorf]

In addition, the fb needs a path, NOT LOS.

Good to know, windows are out of the question.

Couldn't you use a naturally benign and timid creature like a tamed owl tied to a restraint and boxed in to be always placed above a ramp, with a restrained and chained FB on the ramp below, with them both sharing the same ramp tile but unable to touch each other via the restraint? (mainly because the owl will be timid enough to not fly into the same z level as the FB)

Even if it doesn't work (and the FB tears to shreds), it would be a convenient way of eliminating pests for profit that is compact (catsplosion etc) by tethering them up safely and collecting webs off the ramp.

Key -CH -chain/restraint etc, FB - forgotten beast, Re - ramp entrance / Rex - ramp exit, W - walls, C - creature, D - door

Z level 1

WWW
W(CH)(FB)Re
WWW

Z level 2

WWW
Rex(C)D
WWW

[Dozebôm Lolumzalìs]

I'm sorry, but... You can't chain a forgotten beast. To chain something, it first has to be caged (unless it's tame). Webbing forgotten beasts cannot be caged, AFAIK. Unless perhaps you use a cave-in to stun them. And besides, I find it unlikely that the giant dimetrodon made of steel, beware its webs, will just sit there on the chain even though it could just destroy it and be on its way.

[FantasticDorf]

cave-in to stun them

Exactly the method i would recommend to be used. stunned over some GCS webbed cages, assign a suitable dwarf to the job of restraining it on a chain via a burrow to prevent accidents, where it will become harmless to dwarves and aggressive to anything else.

[PatrikLundell]

cave-in to stun them

Exactly the method i would recommend to be used. stunned over some GCS webbed cages, assign a suitable dwarf to the job of restraining it on a chain via a burrow to prevent accidents, where it will become harmless to dwarves and aggressive to anything else.

Won't work. FBs/Titans are stun immune, and if they're web slingers they're web immune as well (as jwoodward48df said).