For determining feats, here are their elemental "peers":
Fire Monolith: Alertness, Blind-Fight, Cleave, Combat Reflexes, Dodge, Great Fortitude, Improved Critical (slam), Improved Initiative, Improved Natural Attack (slam), Iron Will, Mobility, Power Attack, Spring Attack, Weapon Focus (slam)
Primal Fire Elemental: Alertness, Blinding Speed, Combat Reflexes, Dire Charge, Dodge, Epic Prowess (x2), Epic Toughness (x4), Epic Will, Great Fortitude, Improved Initiative, Iron Will, Lightning Reflexes, Mobility, Power Attack, Spring Attack, Superior Initiative, Weapon Finesse, Weapon Focus
(slam)
Imix: Blind-Fight, Cleave, Combat Expertise, Combat Reflexes, Corrupt Spell-Like Ability (fireball), Dodge, Epic Fortitude, Epic Will, Improved Critical (slam), Improved Initiative (B), Improved Whirlwind Attack, Mobility, Power Attack, Quicken Spell-Like Ability (wall of fire), Spring Attack, Whirlwind Attack
Zaaman Rul: Blind-Fight, Cleave, Combat Expertise, Combat Reflexes, Dodge, Epic Fortitude, Epic Will, Improved Critical (flaming sword/longsword), Improved Initiative (B), Mobility, Power Attack, Purify Summoning, Quicken Spell-Like Ability (scorching ray), Spring Attack, Whirlwind Attack
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Water Monolith: Alertness, Awesome Blow, Cleave, Dodge, Great Cleave, Improved Bull Rush, Improved Critical (slam), Improved Natural Attack (slam), Improved Sunder, Iron Will, Lightning Reflexes, Power Attack, Weapon Focus (slam)
Primal Water Elemental: Alertness, Cleave, Combat Reflexes, Devastating Critical (slam), Dodge, Epic Prowess (x2), Epic Toughness (x6), Epic Will, Great Cleave, Improved Critical (slam), Improved Sunder, Iron Will, Lightning Reflexes, Overwhelming Critical (slam), Power Attack, Weapon Focus (slam)
Ben Hadar: Awesome Blow, Blind-Fight, Cleave, Epic Reflexes, Epic Will, Great Cleave, Improved Bull Rush, Improved Critical (claw), Improved Initiative, Improved Sunder, Persuasive, Power Attack, Purify Summoning (B), Quicken Spell-Like Ability (control water), Weapon Focus (claw)
Olhydra: Awesome Blow, Blind-Fight, Cleave, Combat Expertise, Corrupt Summoning (B), Dodge, Epic Reflexes, Epic Will, Great Cleave, Improved Bull Rush, Improved Critical (slam), Improved Initiative, Improved Sunder, Power Attack, Quicken Spell-Like Ability (control water), Weapon Focus (slam)