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<blockquote data-quote="JohnRL" data-source="post: 5536268" data-attributes="member: 82036">This requires a couple of rulings from your DM - Is your campaign's outer space similar to the real universe? And do fluid environments flow through portals, or do portals only work on specific creatures? Assuming the seawater does flow through, you will get a gradual draining of your world's oceans. Sea life will also get sucked through, so on the other side spelljammers may find the remains of sahuagin, mermen and locathahs that have undergone catastrophic decompression. It is unlikely that your DM will give your character any XP for contributing to these deaths, but it is worth asking about. A large object or creature (such as a giant shark or kraken) may well get stuck and block the portal, or intelligent sea creatures may intentionally block the portal with a boulder. On a rough assumption that water is passing through the portal at 10 cubic metres per second, and there is approximately <a href="http://http://www.lenntech.com/specific-questions-water-quantities.htm" target="_blank">1300 million cubic kilometers </a>of salt water on your world, this will take a long time for any significant drop in sea level. At a loss rate of 0.315 cubic kilometers per year, You have time to either reverse your mistake or cover your tracks and go hide somewhere where angry sailors and fishermen won't find you in a thousand years time when they notice.</blockquote>

[QUOTE="JohnRL, post: 5536268, member: 82036"] This requires a couple of rulings from your DM - Is your campaign's outer space similar to the real universe? And do fluid environments flow through portals, or do portals only work on specific creatures? Assuming the seawater does flow through, you will get a gradual draining of your world's oceans. Sea life will also get sucked through, so on the other side spelljammers may find the remains of sahuagin, mermen and locathahs that have undergone catastrophic decompression. It is unlikely that your DM will give your character any XP for contributing to these deaths, but it is worth asking about. A large object or creature (such as a giant shark or kraken) may well get stuck and block the portal, or intelligent sea creatures may intentionally block the portal with a boulder. On a rough assumption that water is passing through the portal at 10 cubic metres per second, and there is approximately [URL="http://http://www.lenntech.com/specific-questions-water-quantities.htm"]1300 million cubic kilometers [/URL]of salt water on your world, this will take a long time for any significant drop in sea level. At a loss rate of 0.315 cubic kilometers per year, You have time to either reverse your mistake or cover your tracks and go hide somewhere where angry sailors and fishermen won't find you in a thousand years time when they notice. [/QUOTE]

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