Take it easy.
Gretell says...
Once activated, this device is rendered temporarily inert. However, it recharges as you gain experience. | Additional devices of the same type can be combined with it to improve the rate at which it recharges. | Increasing your evocations skill will improve the rate at which it recharges.
Henzell says...
  1. A one charge {xp evoker} that generates a {mutant beast}, a randomized creature that will be stronger with higher Evocations skill. Alternates with {sack of spiders} in 0.31+.
  2. Prior to 0.26, more than one could be used, they stacked, and had a fixed 1/3 chance of destruction with each attempted use. Prior 0.19, they didn't stack and had 5-15 hidden charges before being destroyed, with a 1/3 chance to fail.
  3. koboldina: when in doubt koboldina: use pokemon

Information based on master branch and the great LearnDB.
© Dungeon Crawl Stone Soup, 2010.