Just as the success of a weapon attack in combat is determined by an attack roll against defense, the success or extent of various other damaging, debilitating and status-altering effects is determined by a saving throw against the Difficulty Class (DC) of those effects: the defender makes an opposed roll using d20 + the relevant save (Fortitude, Reflex or Will) versus the attacker's DC. If the saving throw is greater (or equal), then its success may reduce any effect, or even negate it entirely; if it fails, the attack has full effect.
Thus a saving throw always fails if DC > save + 20 (maximum d20 roll), and always succeeds if DC ≤ save + 1 (minimum d20 roll). Otherwise, the chance of success is as follows:
Difficulty Class - save
> 20
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
< 2
0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
50%
55%
60%
65%
70%
75%
80%
85%
90%
95%
100%
For example, a Fortitude saving throw must normally be made at DC 30 if a Deadly Gas Mine is triggered: Fortitude save 9 or less means this throw always fails (maximum 20 + 9 = 29), always resulting in poisoning; however, if it's 19 then it succeeds 50% of the time (roll (11-20) + 19 = 30-39); and if it's 29 or more then it always succeeds (minimum 1 + 29 = 30), never resulting in poisoning.
Stasis (Field) can also be countered by Force Immunity: Paralysis.
Affliction and Plague can also be countered by Immunity: Poison.
Shock, Force Lightning and Storm can also be countered by Damage Resistance: Resist #/- vs. Electrical and Damage Immunity: 100% vs. Electrical.
All except Force Suppression, Force Breach and (Advanced) Throw Lightsaber can also be countered by Force Resistance or Immunity. Enemies with these powers may be encountered in the following locations (highest attacker and power levels and DCs only):
Uncanny Dodge reduces grenade DCs by 2, while Uncanny Dodge 2 reduces them by 4. A successful saving throw halves damage (rounded down) and results in no secondary effect for all but Thermal Detonators.
CryoBan Grenade Paralyzation can also be countered by Force Immunity: Paralysis.
Poison Grenades can also be countered by Immunity: Poison or neutralized afterwards by an Antidote Kit or Heal, while damage can also be significantly reduced or even negated by Improved Toughness and Wookiee Toughness.
Mines can be avoided if you or your party make a successful Awareness check to detect them, then move around them or use Demolitions to disable or recover them. Otherwise:
Gas mines can also be countered by Immunity: Poison or neutralized afterwards by an Antidote Kit or Heal, while damage can also be significantly reduced or even negated by Improved Toughness and Wookiee Toughness.
On Hit properties only apply their effects upon a successful attack roll to a single target, but these effects can be reduced or even negated if a saving throw is equal to or greater than Difficulty Class (some can also be negated by Immunity or Force Immunity, removing the need for a saving throw).
Targets have their Dexterity attribute reduced by 1 for 30 seconds unless they make a Reflex save at DC 14. This effect stacks, and is a property of all sonic pistols and rifles. Enemies with these weapons may be encountered in the following locations:
Targets have 100% chance to be debilitated with fear for 3 seconds unless they make a Fortitude save at the DC. This effect can also be negated by Immunity: Mind-Affecting or Force Immunity: Fear, and is a property of the following:
Targets are killed instantly unless they make a Fortitude save at DC 100, which is impossible without cheating: do not put yourself in a position where you can get hit! Enemies with this property may be encountered in the following locations:
Targets have a chance to be paralyzed unless they make a Reflex save at the DC. This effect can be negated by Force Immunity: Paralysis, and is a property of the following:
Targets suffer damage or weakness unless a Fortitude save is made at the DC. Damage is suffered every 3 seconds for 30 seconds, while weakness results in the temporary but increasing loss of the six physical attributes for 36 or 72 seconds.
Damage
Points
DC
Mild
3 (*10)
15
Average
4 (*10)
25
Virulent
5 (*10)
30
Weakness
Attributes
DC
Mild
-1 every 12 s (*3)
15
Average
-1 every 6 s (*6)
20
Virulent
-1 every 6 s (*12)
100
Both damage and weakness can also be negated by Immunity: Poison or neutralized afterwards by an Antidote Kit or Heal, while damage can also be significantly reduced or even negated by Improved Toughness and Wookiee Toughness. These effects are properties of the following:
Targets have a chance to be slowed for 9 seconds unless they make a Reflex save at the DC. Being slowed reduces movement speed and inflicts -4 Defense, and these effects stack (although duration does not).
Targets have a chance to be stunned unless they make a Will save at the DC. This effect can also be negated by Immunity: Mind-Affecting or Force Immunity: Stun, and is a property of the following:
Plasma mines actually inflict energy damage so an Advanced Flame Thrower can inflict the most heat or fire damage in the game (just as a Carbonite Projector Mark II can inflict the most cold damage) although, as can be seen, enemy droids that use them against you are extremely rare.
These droids can be prevented from using their weapons by debilitating them first using a Stun Droid power; otherwise, any combination of a high Reflex save, Shields, (Improved) Energy Resistance and Damage Resistance can significantly reduce or even negate damage entirely (Reflex > 13 and (Improved) Energy Resistance alone guarantee this for normal Flame Throwers and Carbonite Projectors).
