Here's how the various orbs change the weapon stats (add the numbers below to the stats listed above):
Dull Energeian Fire Orb ----------
STR +1
STA +1
END +11
SV FIRE +3
SV COLD -3
SV POISON -1
Dull Energeian Earth Orb ----------
STR +2
DEX -2
STA +2
AGI -2
HP: +3
MANA: +3
END: +3
SV DISEASE +3
Dull Energeian Ice Orb ----------
AC: -1
STR: -1
DEX: -1
STA: -1
CHA: +1
WIS: +1
INT: +1
AGI: -1
HP: -7
MANA: +7
END: -7
SV FIRE: -3
SV COLD: +3
SV POISON: +1
Dull Energeian Air Orb ----------
STR: -2
DEX: +2
STA: -2
CHA: +1
AGI: +2
HP: -7
END: -7
SV FIRE: +1