* Monsters will now always find a cell to walk to on first attempt as long as there is at least one cell available
* Performance for searching a cell improved, a monster no longer tries the same cell twice
* Removed the "MOB can't move" warning by default; the warning could appear with legit behavior like using Icewall and actually made the monster re-spawn
* Added a config option to monster.conf, where you can re-enable the warning and the re-spawning again
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