Scroll allll the way to the bottom of the creatures file and you'll see some example blocks. Here's some of the stuff you'll want. You'll have to change the parameters though:
 
    begin_timed_block     300;//interval in milliseconds - The interval in which it repeats, 300 is a nice number     begin_conditions;   15;//condition number - The distance the player has to be before they start their stuff       ???.000000;//condition parameter0       0.000000;//condition parameter1	     end_conditions;     begin_effects;           47;//effect number	-say stuff       ???.000000;//parameter1 - the dialog in which to say (see dialog file)       0.000000;//parameter2       0.000000;//parameter3       0.000000;//parameter4     22;//effect number	-Change side effect number       ???.000000;//parameter1 -which side do you want? The human is side 0 by default.       -1.000000;//parameter2 -how long should it be this side for? (-1 is forever)       ???.000000;//parameter3 -any special effects wanted from weapons? Set to -1 for none.       0.000000;//parameter4     end_effects;   end_timed_block
 
 
  Avoid doubling up on "begin" and "end" lines. It happens!
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