spell resistance question

[Dragonjester]

If my wizard is casting a fireball in the center of a group of 8 "generic" 1st level drow fighters, does he roll 8 times to overcome their spell resistance or once?

 

[hong]

8 times, once per drow.

 

[Axiomatic Unicorn]

Hong is correct.

DMG pg. 82.

 

[Dragonjester]

follow up question along the same lines:

if a psion mind blasts a mob of 30 commoners does he set one DC for a will check or 30?

 

[Henrix]

You set the DC, once, every time you manifest a power.

 

[hong]

follow up question along the same lines:

if a psion mind blasts a mob of 30 commoners does he set one DC for a will check or 30?

See the "Variant: Spell Roll" section in the DMG, p.96. Applying the same guideline to psionics means one DC for everybody.