It's generally a bad idea to contingency yourself into a dangerous situation. If the wizard is hindered in any way, the 1000' drop may be worse than whatever he was originally facing.Gaiden said:So with the qualificationthat the PC is outside most of the time he could specify to dimensional door straight up. Even if he is inside a structure it is unlikely that he will not end up on the outside of that structure when his direction is upwards.
It's generally a bad idea to contingency yourself into a dangerous situation
...none of which help if you got hit with feebelmind before your contingency triggered. (No, not even the mount. If it's small enough to DD with you, it's too small to carry your weight, and reduce is not dismissable.) Parachutes don't exist in the standard D&D world, and characters lack the knowledge to spontaneously invent them.Gaiden said:
For example, at that level you could have a persistant reduced flying mount, you could enlarge your flying familiar, you could cast dimensional door again, you could cast web, etc. etc. etc.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.