ToME: the Tales of Maj'Eyal

I have a few questions about items and some of their qualities/abilities:

"Base Power" - how important is this in overall combat, and how important is the range of value?

"Accuracy bonus: +0.x% crit|dam|procs / acc" - what exactly does this do?

"Changes damage: +x% $type" - am I correct in that this increases the amount of damage of $type? So if I do 100 nature damage before these bonuses, a +8% nature bonus increases it to 108? I get this confused with changing damage done to another type entirely.

"Effects on melee hit" - there are a number of these I've seen, including
- "X% chance to gain Y% of a turn" - if this activates, how is the turn time given? Does it have to accumulate to 100% before working?
- "X% of causing talent cooldown" - this would cause the target to have a random talent go into cooldown?
- "X% to corrode armor" - what effect does that have?
- "X% to cripple target" - target is unable to move? any other effect?
- details on others would be helpful too

"On hit (burst X): Y damage" - I read this as, "when I hit, everything in radius X takes Y damage (of some special type)". Is this correct?

Thanks in advance!

Stuff I can answer off hand:

ibanix wrote:"Base Power" - how important is this in overall combat, and how important is the range of value?

The formula is rather complex. Roughly, it's proportional to the square root of the lower end of the range.

ibanix wrote:"Accuracy bonus: +0.x% crit|dam|procs / acc" - what exactly does this do?

This is a bonus you get for every point of accuracy you have above the target's defense.

ibanix wrote:"Changes damage: +x% $type" - am I correct in that this increases the amount of damage of $type? So if I do 100 nature damage before these bonuses, a +8% nature bonus increases it to 108? I get this confused with changing damage done to another type entirely.

Yes, this will increase all damage you deal of that type, whether it's from a weapon, spell, etc. You can check your current totals on the offense tab on your character sheet.

ibanix wrote:- "X% chance to gain Y% of a turn" - if this activates, how is the turn time given? Does it have to accumulate to 100% before working?

Speed is also complex.

ibanix wrote:"On hit (burst X): Y damage" - I read this as, "when I hit, everything in radius X takes Y damage (of some special type)". Is this correct?

Yup.

Thank you. A few other questions I would add:

"X% to reduce powers by Y%" - what does this do?

"X arcane resource burn" - depletes target's mana? are other types affected?

Reduce powers is reducing phys/spell/mindpower by 20%, so a decent reduction of their offensive stats. Arcane resource burn reduces the following resources by the following values:
So 20 burn would reduce 20 mana, 10 vim and 5 pos/neg.

ibanix wrote:- "X% to corrode armor" - what effect does that have?
- "X% to cripple target" - target is unable to move? any other effect?

Have this proc on a mob and inspect their debuffs to see the exact effect.