Blackguard

gets additional Smite Good use at each 5th level
Blackguard gained new feat at level 3 - Aura of Despair: -2 saving throws to nearby enemies;
has spellbook, spell selection is similar to paladin, needs wisdom 10+spell level to cast spells
feat Epic Fiendish Servant removed from game, now the summon from this feat will be gained automatically at lvl 15 of blackguard
all blackguard summons now get these traits:

Improved Evasion
Spell sharing (see Wizard class changes above)
get Blood Bond feat at character level 16+ - +2ab, saves and skills anytime the master is in combat
get SR equal to master's BG level+5 at character level 19+
All BG summons now gain extra (uncapped) stats according to the table at: https://www.d20srd.org/srd/prestigeClasses/blackguard.htm + the informations at Epic Blackguard page
the level scaling will now bring Epic Vrock to the same level as is master's BG level (in vanilla it has -4 adjustment for some reason)