Velmont said:
Velbrik's Stutterstep
I like the spell, but there is something I don't like. It is not in the balance of the spell, but in the concept. Travelling between planes, I always have seen that as a hard feat of magic, and doing such at first level spells, is pretty strong, even if it is only for a short time.
I do agree with you on this point - a first-level spell "shouldn't" be able to do things like this, even if they're mechanically reasonable. Likewise, you shouldn't have a first-level spell that summons thunderclouds and rains fire for a mile radius, even if it only does 1 point of damage to 1d4 buildings in that radius. I thought about that as I was designing the spell.
However, I couldn't really think of another way to achieve the same effects magically; something like "This spell grants you +20 to your Tumble checks for 1 round/level," seemed just too lame to me. Plus, I liked the image, which was what made me write this spell up in the first place.
I guess if you wanted to think about it another way, Summon Monster I does the same thing; it summons a creature from another plane (in this case, the caster is summoning himself to another plane, briefly), but "trades" mass (you can't summon in a dragon with Summon Monster I) for the magical bonds that forces the creature to obey your commands. Since you don't need to command yourself, that energy can be diverted to summon a higher mass; like
planar binding lets you summon more powerful creatures than
summon monster, but you don't automatically have control of them. It sort of makes sense.
Velmont said:
Maybe it could be a level higher, as you can consider that spell to be an automatic success on any tumble check made, and in that case, could easliy be compare to invisibility, who is virtually an automatic success on Hide...
Well, it's not really an automatic success on any Tumble check, which is what
invisibility might do; at most it's +20 to the skill for 1 round/level, which is a better bonus than
jump, of the same spell level (though it's not a better bonus after caster level 5), but for 10% of the duration.