Im trying to build the Pure-classed Offensive Caster Cleric from this post:

http://forums.ddo.com/showthread.php?t=223253

But the build was updated mentioning that RS ( Radiant Servant PrE?) should be used on all cleric builds. Can someone explain what is RS? What do i need to change for that?

Also why just one point into Tumble?

This is what i choose at character creation:

(32 point)
str 14
dex 8
con 15
int 10
wis 18
cha 8

Feats:
spell penetration feats
toughness feats

Skills:
Balance
Concentration
one point into Tumble
rest into jump


Thanks for any replys, im still learning character building in this game.