And this would be my creature for Summon Undead IV:
(Huge) Nine Headed Hydra Zombie:
HP: 63
Initiative: +0
Speed: 20
AC: 10 (touch 6, ff 10)
Attack: 9 Bites +11 (2d6+6)
Space/Reach: 15/10
SQ: darkvision, DR 5/slashing
Saves: fort +3, ref +3, will +6
Full attack +13 is calculated like this:
BAB...