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Editing 23a:Chasm
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− | + | :''A miner has found a large chasm cleft through the mountain.'' | |
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The '''chasm''' is the second major landmark encountered within the mountain (the first being the [[cave river]]). Like the river, you must build a [[bridge]] over it to get past it. This obstacle is between 3 and 5 spaces wide, and angles between 148 to 200 spaces from the cliff face. The chasm tends to make sharper turns than the river, and its offshoots are always straight and between 1 and 2 spaces wide. | The '''chasm''' is the second major landmark encountered within the mountain (the first being the [[cave river]]). Like the river, you must build a [[bridge]] over it to get past it. This obstacle is between 3 and 5 spaces wide, and angles between 148 to 200 spaces from the cliff face. The chasm tends to make sharper turns than the river, and its offshoots are always straight and between 1 and 2 spaces wide. | ||
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==Chasm monsters== | ==Chasm monsters== | ||
− | Once the chasm has been discovered, there is a 25% chance per season of monsters emerging to attack your dwarves regardless of their activity. Chasming refuse or dumping water/magma into the chasm will trigger up to 3 additional attacks per season. If you have built any [[well]]s beyond 130 tiles of the cliff face, certain monsters have a chance to emerge from them instead of from the | + | Once the chasm has been discovered, there is a 25% chance per season of monsters emerging to attack your dwarves regardless of their activity. Chasming refuse or dumping water/magma into the chasm will trigger up to 3 additional attacks per season. If you have built any [[well]]s beyond 130 tiles of the cliff face, certain monsters have a chance to emerge from them instead of from the river itself (1% chance per valid well, minimum 10% and maximum 50%); wells closer to the surface will be used by [[cave river]] creatures instead. |
The monsters from the depths are: | The monsters from the depths are: | ||
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* [[Large rat]]s* | * [[Large rat]]s* | ||
* [[Naked mole dog]]s* | * [[Naked mole dog]]s* | ||
− | * [[Troglodyte]]s | + | * [[Troglodyte]]s <!-- lacks RIVERATTACK token, so may only appear in caves in Adventurer mode --> |
* [[Giant mole]]s* | * [[Giant mole]]s* | ||
* [[Giant cave spider]]s* | * [[Giant cave spider]]s* | ||
* [[Iron man|Iron men]] | * [[Iron man|Iron men]] | ||
− | Up to 6 of the above creatures can be found in any given chasm. Creatures marked with a "*" are capable of emerging from [[well]]s | + | Up to 6 of the above creatures can be found in any given chasm. Creatures marked with a "*" are capable of emerging from [[well]]s. |
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− | + | Attacks from trolls are very rare, but can be dangerous. Trolls are strong and are capable of destroying buildings (including [[door]]s and [[floodgate]]s). Gremlins can throw levers, which can lead to all sorts of havoc, so hide your levers behind a door and a trap or two. But be warned, Gremlins themselves do not set off traps. | |
==Chasm defense strategies== | ==Chasm defense strategies== | ||
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#Place a floodgate there, adjacent to the magma. | #Place a floodgate there, adjacent to the magma. | ||
#Build a channel from the floodgate to your chasm-flood area. It is simple enough to bridge a magma-filled channel with stone or any metal bridge, so you need not worry about impairing the movement of your dwarves. | #Build a channel from the floodgate to your chasm-flood area. It is simple enough to bridge a magma-filled channel with stone or any metal bridge, so you need not worry about impairing the movement of your dwarves. | ||
− | #Dig a | + | #Dig a very wide entrance to the chasm that meets your channel. |
#Place a floodgate at the other end, making sure your miner has a way out (or not). (Alternatively, just dig out your entire chasm-flood room as a channel. A filled channel next to the chasm will flood the chasm.) | #Place a floodgate at the other end, making sure your miner has a way out (or not). (Alternatively, just dig out your entire chasm-flood room as a channel. A filled channel next to the chasm will flood the chasm.) | ||
#Link up the floodgates to a lever. | #Link up the floodgates to a lever. | ||
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To avoid all retaliatory attacks while you nuke the chasm, you can seal it off by digging a channel which covers every exposed portion on the west side of the chasm. Build an aqueduct to bring magma across the chasm and pipe it into this channel. (You can also build a floodgate pointed at your existing bridge(s); the flow will cross the bridge, but be stopped by the channels.) | To avoid all retaliatory attacks while you nuke the chasm, you can seal it off by digging a channel which covers every exposed portion on the west side of the chasm. Build an aqueduct to bring magma across the chasm and pipe it into this channel. (You can also build a floodgate pointed at your existing bridge(s); the flow will cross the bridge, but be stopped by the channels.) | ||
− | Most chasm-dwellers cannot cross a magma-filled channel, and will die without ever being seen. However, the occasional troll might be able | + | Most chasm-dwellers cannot cross a magma-filled channel, and will die without ever being seen. However, the occasional troll might be able get across it, so line the channel with some traps just to be extra safe. |
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