How would people feel about this? It would only be a small proportion of the damage otherwise done. They could kill themselves this way or not, depending on suggestions.

Probably (I think it is easier to code) we wouldn't care about attack type v resistance (after all the hitter may in fact be immune to his own attack). IOW he will hurt himself (punishment for fumbling).

I said hitter for a reason. Just mobs or players too (and if so just in PvM or PvP too)?

Spell fails:

0-Backfire; Damage causing and "negative" status spell targets caster instead of selected target, causing some percentage of damage to caster or the "negative" status.  "Positive" status causing spell remains on target but causes opposite status ie "Improved Strength" status would cause "Reduced Strength" status.

1-Bad aim; Spell's target changes to random target in range.  NPC's, Mobs, PC's can be targeted and can receive the spell's effect, not an opposite effect as for "Backfire".

2-Distracted caster; Increased casting time and/or reduced effectiveness of spell (reduced range, reduced damage, reduced time of status effect, reduced power of status effect).

I agree!

HAHAHAHA, i like that, a Horn causing a firestorm around a player.  I think it would be funny if it was like the old position 0 firestorm where it had a nova effect, but goes inward toward the player instead of outward.

This actually sounds like alot of work now, since you would have to have a fumble contingency for each spell...

All the more fun for when it does happen

haha, like:

"I pray that thee gets healed!" character gets hit "God d@#$%"

Player being healed: "AHHHHHHH IT BURNS...."