2 added 6 characters in body
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I can see two different ways to do this:

  1. Keep it simple and use falling damage
  2. Treat it as a trap using the DMG rules (pp121), with a DM fiatruling to determine the Severity & Level. 

I can see two different ways to do this:

  1. Keep it simple and use falling damage
  2. Treat it as a trap using the DMG rules (pp121), with DM fiat to determine the Severity & Level.

I can see two different ways to do this:

  1. Keep it simple and use falling damage
  2. Treat it as a trap using the DMG rules (pp121), with a DM ruling to determine the Severity & Level. 
1
source | link

I can see two different ways to do this:

  1. Keep it simple and use falling damage
  2. Treat it as a trap using the DMG rules (pp121), with DM fiat to determine the Severity & Level.