I am thinking of using this 500 pt Elemental army in a game tomorrow.
I'm looking for any advise about it. The game is Unlimited Rules. The scenario will be to take a tower w/fort located in center of the board.
The opposition will be a 500pt Necro Army. No one will be in control of tower w/fort at start of game.

All units in my army need to be Elemental units.

My Army Thus Far.
Single units
1x-Thunderdoom Troll-Uni-90pt
1x-Warbear*-35pt

Formation #1
1x-Corrupted Priest***-61pt
2x-Troll Zombies *-27pt/each

Formation #2
2x-Troll Gunner**-39tp/each
1x-Demi-magus***-39pt

Formation #3
1x-Corrupted Priest*-48pt
1x-Troll Artillerist*-29pt
2x-Troll Artillerist**-33pt/each
--------------------------------
Total points = 500

For 500 points that isn't a lot of figures. I would try dropping a few expensive units for more cheaper ones.

Any Sugestion on what to drop and what to add?

Try dropping the demi-magus hes not elemental :-D

I would personaly take out the Thunderdoom and grab a Wind Minon. He may not be elemental but he will be extreamly useful in taking out that accursed tower.

doesn't it have to be all elemental? so that rules out the wind minion( if i remember correctly it's magespawn) and the elven demi-magus is atlantian and elemental. i would consider having two groups, ranged to dish out hurt and dismantle the fort thing and melee to assist and provide knockout punch, the cor preist is nice but the weak version is roughly 18 points less and is better cause all that happens to base is a 1 pt. lose to attack, i'd upgrade the bear to tough , that will leave you w/ roughly 7-10 points left see if you can upgrade other units with that, numbers are good but quality, in my humble opnion, used wisely can win other then that it's a good group good luck

Well we played.
The opposition did not go with all necro. Never the less the fight was over before it began.

His army consisted of:
BP-War Wagon uniq-109pts the passenger a
BP-Wrath Golem ***-71pts
A Solonavi Striker uniq-112pts
Fanged Gunslinger***-56pts
Fanged Gunslinger**-44pts
Fanged Gunslinger*-33pts
Corrupted Priest*-48pts and a
Throttle Worms**-27pts

It went down like this! His Striker went straight for the Tower, followed by the three gunslingers and the priest. His Wagon headed in the same direction but first swung over closer to my units and took a shot at one of them. Then ran for the tower. His Worms followed the Wagon.

With his Striker, all three Gunslingers, and his Priest on top of the tower it was
unapproachable!
Not to mention the protection they received for the fortification and height a +4 defense!

My units moving a full speed straight toward the Tower got their too slow!

There was some hindering terrain around the tower that I used to help in my defense but there was nothing I could do! My best range was 12", the tower and the Strikers was 14" and the gunners was 6".

There wasn't much I could do, so I charged out and took on the Wagon but after engaging it it pushed and broke away and rammed in to one of my Troll Gunners leaving the units I moved in for the attack standing there for the picking by the tower and the units on top.

Next I attacked the wagon with all I had since it was pushed and did quite a bit of damage to it.
It tried to break but failed and i again battered on it. But it didn't stick around long and it pushed and ran again. Again leaving my units standing in the open for the plucking.

The wagon had lost the back and one side and another badly damaged. The front was weakened as well so he parked it behind the tower. The Wrath Golem only took a few hits and now climbed out to help finish off what was left of my units. I was able to pull back and heal a few of them but all for nothing. It was coming to and end I had no Kills to speak of, I had lost three units at this point one which was my Unique the Thunderdoom troll. With no other options I charged all units toward the tower using my priests as healing backup. Only one made it through to the towers barrages, only to be gunned down next turn!

What a nightmare! The worst lost I have ever encountered, and hope the worst lost I will encounter!

The Dead Army!