Well, to have at least on character posted in here, here's the rough write-up for a psion, who should be able to defeat all five creatures with a very good chance (some PP are left-over still, if a spell should fail). And the character has tons of options beyond what is needed here as well.
Elan Psion Telepath 10th level
S8 D12 C14(16) I20(24) W14 C6
HP 61
PP 125
S: Autohypnosis +10(6cc), Concentration +21(13), Diplomacy +13(13), Knowledge (arcana) +8(1), Knowledge (dungeoneering) +10(3), Knowledge (local) +8(1), Knowledge (nature) +10(3), Knowledge (psionics) +14(5), Knowledge (religion) +8(1), Knowledge (the planes) +10(3), Psicraft +22(13), Sense Motive +15(13). Speaks Common and four other languages.
F: Psionic Meditation, Psionic Endowment, Greater Psionic Endowment, Empower Power, Overchannel, Expanded Knowledge (Metamorphosis), Metamorphic Transfer.
P: Crystal Shard, Detect Psionics, Defensive Precognition, Inertial Armor, Vigor; Psionic Suggestion, Concussion Blast, Detect Hostile Intent, Energy Stun; Crisis of Breath, Hostile Empathic Transfer, Dispel Psionics, Touchsight; Psionic Dominate, Schism, Psionic Dimension Door, Psychic Reformation, Energy Adaptation, Telekinetic Maneuver, Metamorphosis; Psionic Plane Shift, Power Resistance.
E: Headband of Intellect +4 (16k), Third Eye of Penetrate (8k), Psionatrix of Telepathy (2k), Shirt of Health +2 (4k), Cloak of Resistance +2 (4k), Ring of Lesser Vigor (Fast Healing 1) (8k), Lesser Belt of Concentration (2.5k), 4,500 gp.
Halfling - Dominated (duration increased to 1 day/lvl; 11 PP). DC 26.
Treant - Blasted away with an empowered Energy Stun (fire; (8d6+8)x1.5; 12 PP). DC 26.
Dread Wraith - Destroyed with multiple (5) empowered Concussion Blasts ((4d6)x1.5; 11 PP). That one's costly!
Hezrou - Dominated (type upgraded and duration increased to 1 hour; 12 PP). DC 26, +14 vs SR/PR.
Fire Elemental - Dominated (type upgraded and duration increased to 1 hour; 12 PP). DC 26.
Bye
Thanee