Which spells cancel out?

[rayworks]

So I've got an air sorc, and I know that firewall and ice storm will cancel each other out (sometimes).

So it got me to wondering, which spells won't work together, or will work if two casters cast them simultaneously?

For example, if I cast firewall and then cyclonic blast, it will blow out the firewall. But what if I cast firewall and then a 2nd caster does cyclonic blast, or ice storm, or acid cloud?

[awang20]

Yep, other casters can take out your firewall with cyclonic blast/ice storm and the like. Friendly casters and enemy casters alike.

[Sarisa]

Cyclonic Blast (and its base, Gust of Wind) will blow away any cloud and Wall of Fire. It will illogically blow out Otto's Sphere of Dancing as well. I believe it also blows away Ice Storm and Sleet Storm.

Ice Storm trumps Wall of Fire. You can, with very careful positioning, still manage to hit a mob with both, but it's difficult. You cannot cast a Wall of Fire inside an Ice Storm. From a recent post, Incendiary Cloud also appears to work in this manner with Ice Storm.

Most Fire spells will destroy Webs. Wall of Fire, however, will not. Fire Shield (either Hot or Cold) will give you immunity to web, but the effect does not last the full duration of the shield.

Bless (but not Mass Aid) will counter and dispel Bane. I believe it works the other way as well.

Good Hope and Crushing Despair are mutual enemies.

Haste and Slow also will dispel one another, however, you can use Freedom of Movement to become immune to Slow.