Furthermore, casting Elemental Sword on this summon does result in the visual effect and changes on it's character sheet, however no damage/+AB is applied to attack rolls.
Spell Focus: Evocation
Affected Spell List:
Hellball and Greater Ruin: Epic Spell Focus: Removes the 30d6 of backlash damage.
Mordekainen's Sword:
Spell Foci feats will provide a stat bonus to every summon that corresponds to the magic school associated with the Foci. Details can be found Here
Spell foci feats will provide a stat bonus to every summon that corresponds to the magic school. Conjuration affects Conjuration summons, Necromancy affects Necromancy summons.
Each level of focus provides:
+1 to all skills the summon has ranks in
+1 hit die worth of hit points (meaning, as if the creature was 1 level above in terms of HP, both adding base class HP and CON modifier).
+1 AB
+1 Damage
+1 AC
+1 Universal Saves