Defensive spells against a Blindsensing creature

[Firengineer]

Myself and my party are about to enter deadly combat with a great creature and it has blindsense, oh no!

What kind of defensive spells could be cast to boost AC or general survivability that isn't countered by blindsense? Normally we would use spells such as displacement or mirror image, but these no longer work. We can cast up to 4th level wizard/sorcerer spells.

[Reecy]

HAHA Awesome question

What terrain and such are you going to be in... I have quite a few tricks for this.

[Lincoln Hills]

There aren't a lot, sad to say. If the fluff about the creature's blindsense focuses on hearing, you can hope your GM will rule that deafness will shut down that sense, but your best bets may be direct AC-raising or DR-providing spells - shield, stoneskin, etc. You may want to rely on battlefield control rather than direct defense - grease and sleet storm, for instance.

I did once house-rule that being inside a flying swarm granted concealment (not total concealment) vs. blind-sight: that obviously isn't a feature specified in spells like insect plague, but I figured that inside a cloud of bugs you hear bugs, smell bugs, taste bugs, electro-locate bugs and psychically divine that you are surrounded by bugs.

[Firengineer]

We're actually going to be in the air, fighting a dragon. So this significantly limits the ability to mess around with terrain. Normally that's what would be done; with a wizard using walls of force, pits and the like. But now it's going to be an aerial brawl.

[Artanthos]

Remember: blindsense does nothing to negate concealment. It merely allows the creature to sense which square its opponents occupy.

[FlamingPhenex]

If you're talking about blindSENSE and not blindSIGHT; then mirror image and displacement (along with anything granting concealment/invisibility) still grant a miss chance. The only benefit sense gives with respect to these is knowing which square you're in...but it's not as precise as sight, which would negate most of the above.

Edit: Ninja's :(

[Firengineer]

Apologies, I meant to ask about blindsight, not blindsense. I get those mixed up sometimes. So it can negate concealment entirely.

Side question: Does blindsense negate Mirror Image? I would imagine not, since the illusions all occupy the same square.

[Claxon]

So, it's weird, but no Mirror Image doesn't defeat Blindsight.

Why? Because the creature is question sees 4 of the guy in front of him with his regular vision. He closes his eyes and his blindsight still works. Mirror image requires the attacker to see the images to be fooled. The opponent with blindsight with his eyes closed takes no penalties to his attack and attacks you, negating your Mirror Image, and then opens his eyes after he has finished.

[wraithstrike]

Mirror image does not bypass blindsight even with his eyes open. Basically his eyes are saying there are X number of guys in random locations, but blindsight is only detecting one creature in a specific location, and that one location is matching ONE of the images.

Blindsense however is defeated by mirror image.

[Cult of Vorg]

Blindsense allows the eyes closed for 50% miss instead of the mirror image roll.

As far as flying dragon fights, best defense is not being there. Magic jar minion, projected image.. a barred force cage and elemental protection could keep you safe, but if the fight moves away it could get out of range..