Wich book do you recomend for this?

[JoeGKushner]

I have two suggestions for you. The first is Monster Handbook written by Mike Mealrs for Fantasy Flight Games. It has was to alter the creatures and you can make creatures a little more powerful without increasing the CR. It was written for 3.0 but really should work well for 3.5

http://www.enworld.org/reviews/index.php?sub=yes&where=currentprod&which=FFGMH

THe other book is Delux Book of Templates. It has a lot of templates that can be used to increase the power of creatures as well.

http://www.enworld.org/reviews/index.php?sub=yes&where=currentprod&which=BoTDE

I'll echo these recommendations. Both good books for pumping up your monsters. Green Ronin has an Advanaced Bestiary coming out soon that's a book of templates with lots of examples so it too will be worth looking into.

 

[diaglo]

bring 'em 4ed: http://www.kenzerco.com/images/rpg/hackmaster/hob9.jpg

 

[Trencher]

Thanks for the heads up on the new monster book from green ronin I collect monster books so I am going to pick that one up.
And I have been a Dm for 15 years, I know something about tactics.. But my favorite monster is a creature who is so though and dumb that it does not need tacktics to be dangerous. In any case I am going to pick up the monster hand book.
Thanks for the advice.

 

[devilish]

Grim Tales

I'd recommend the appendix of Grim Tales, which
allows you to figure out why a creature has a certain
CR and how to upgrade/modify it with whatever you want.

Create kobolds with haste 5X a day ability.
Poison spiting ogres, incorporeal worgs, and
the charts will let you figure out the CR for each creature.

 

[Katerek]

I'd recommend the appendix of Grim Tales, which
allows you to figure out why a creature has a certain
CR and how to upgrade/modify it with whatever you want.

Create kobolds with haste 5X a day ability.
Poison spiting ogres, incorporeal worgs, and
the charts will let you figure out the CR for each creature.

For fear of being a me too poster...

I second this recomendation. Grim Tales is sweeter than a horse trough of cherries jubilee.