Let's see if I can make this clear ... and understandable....
Runeword: Chance (for any melee weapon)
100% chance to cast a random effect on striking.
you have a 50-50 shot of killing a monster, or killing yourself. A random effect will either hinder your ability or help it.
This will use the same chart that a MF drop is used, but instead of picking a item, making it normal, magical, unique ect. It will choose what effect will happen in a melee combat phase and to whom.
EXAMPLE
Can be seen as such:
50% chance to help you
50% chance to hinder you
Once that is figured out, it figures out what will happen:
(these are only examples of what could)
1-10 Poison Nova lvl X
10-20 Increase attack damage X%
20-30 Increase Defense X%
30-40 Auto Battle Orders X lvl and X sec
40-50 All damage done is Magical
60-70 +X to all skills
80-90 Immune to physical, magical, elemental, or certain elements for X sec
90-95 Auto cast Golem
(These are 1% chances to cast on you only, thats why its called Chance)
96-97 Loot (item drops depending on your MF% times 2)
97-98 Instant death (one shot one kill on your enemy)
98-99 Facet Attack (casts all die facets on striking)
99-100 Revive character if slain*
Then it figures out what % of damage, or lvl of skill used ect.
Like lvl 3 Bone Armor automatically casted on a Pally for X amount of time, Def increased by 100%, to Back ally Ho Monster, ect.
This could be the best weapon, or the worst ever. It all depends on landing a hit and getting good luck.
MF% will play no roll in better odds, nore will anything else**.
* There is only a 1% chance for the revive skill to activate on you only (not enemies.
If you die and get the revive, you come back where you died with 3 seconds of immunity to everything, just so you can grab your body, cast a prebuff if possible, and fight on. During this 3 seconds, any damage dealt to enemies is double it's normal, as well as your stats. If you die again within 30 seconds of reviving you loose double the experience if in non normal difficulty.
** if using duel Chance Runewords, it still acts as if you have only 1 weapon. Again nothing will increase the odds in your favor.
Runeword: Apocalypse (for any melee weapon)
+350% ED
50% Faster attack Rate
100% chance to cause Open Wounds
4% Life steal
3% Mana steal
5% chance to cast lvl 15 Rabies on striking
1% change to cause death*
* A dark robed figure appears and slices enemy in half then disappears.
Runeword: Final Stand (for any character Armor)
+100% to find Magic Items
+50% to mana regeneration
+25% to life regeneration
Skills cost half mana to use
1% chance to create doppleganger*
* when you are down to 1% of your total life, you are auto teleportal to a random spot (no more then 3 yards away) and where you were is a clone of yourself, using the same skills as you, with the same gear and max stats. Your life is doubled until the clones life has depleted. Think of it as a more powerful version of a Assassins shadow.