Adventure Tools

You can take an existing monster from any D&D rulebook or online article and customize it for your own campaign, including changing its statistics, increasing its level and role, replacing powers, and adding new ones.

You can also create new monsters and auto-calculate their statistics based on the choices you make.
The D&D Adventure Tools installer does not currently install .Net Framework 3.5 sp1. To install and run the D&D Monster Builder, you can download .Net Framework 3.5 sp1 , or can first install the D&D Character Builder.
Adventure Tools Requirements
Display: 1024 x 768
Supported Operating Systems: Windows Vista; Windows XP SP2
Microsoft .NET Framework 3.5 Service Pack 1
Microsoft .NET Framework 3.5 Service Pack 1 Requirements:
Supported Operating Systems: Windows Server 2003; Vista; XP
Processor: 400 MHz Pentium processor or equivalent (Minimum)
RAM: 96 MB (Minimum); 256 MB (Recommended)
Hard Disk: Up to 500 MB of available space may be required
Display: 800 x 600, 256 colors (Minimum); 1024 x 768 high color, 32-bit (Recommended)
Not supported: Win 98, Win NT/Server 2000, Mac, Linux, or DOS