In human form i cast Stoneskin myself (DR 10/+5, 150mins or 150dmg) and Master Air (L2, Fly 90 (good, 15 rounds), turning into an Ironmaw as a wildshape, followed by Transport Via Plants to get right near the battle, and on that same round a move action to fly into combat. When I arrive (the third round), I set myself up in the air, too high for the baddies to reach, but in such a place where any step forward towards the rest of the party provokes an AoO from me with my 60 feet reach, and high enough in the air that I can dangle opponents helplessly from my tendrils.
Description: Rimathil, having just sprouted bat wings, grows taller and his body bulges out and hardens. His legs are replaced with a tangle of roots, his arms divide into four enormous tendrils, and his hair grows into branches with greenish-red leaves. His wings grow proportionally. Soon, he resemble a giant oak tree with a face on the trunk and bat wings. I sneer with my huge toothy maw, then taunt "I am but the first of the reenforcements. Surrender now or we will crush you!" (free action to talk)
(Stats w/buffs: Huge Plant, Str 34, Dex 10, AC: 32, hp 142, DR 10/+5, Attacks: 4 tendrils+Bite, reach 60' @ +22/+22/+22/+22/+20, DMG: Tendrils: 2d6+11+Sicken (-1d6 Con, DC 22) + Attaches (DC 28 to break free, otherwise dmg and can be brought 10 feet closer as a free action) + Wounding 3 cumulative. Bite: 1d8+5. Also: Engulf: fits 2 medium creatures, AOO OR save, once inside, they must hold their breath or suffocate, and take tendril 2d6+11/round)
OOC: I keep an eye out for spellcasters. They are my highest priority to use AOOs on.