Originally Posted by
psykopeta
it increases your caster lvl but not for taking new spells:
u said 14 clr + 4 from sentinel
that means u can cast lvl 7 spells, but when the spell says "4-6 damage for every caster lvl (with 1 maximum or not)" u'll be casting em at 18th lvl, but u won't be able to cast implosion(lvl 9 spell, 17 lvl clr needed)
so ur blade barrier will keep do a bit more damage (max lvl for damage in bb is 15, and u had only 14 clr) but other spells may not increase its damage cause they were already in its max damage per caster's lvl
also increases 1 point ur spell penetration per caster lvl, so ur spell penetration would be 18 instead of 14 (only divine casters with divine ED, arcane casters with arcane ED)