"Don’t let the archaic design fool you. Because of the Trebuchet’s simplicity, it is able to accept nearly any sort of ammunition. Blocks of stone, flammable canisters, baby raptors...you name it, it can throw it."
Zoey's Trebuchet is a unit added in the 2.9.8 Patch. It is unlocked at Level 56 and has 220 . Zoey's Trebuchet is informally known as "Trebuchet" or simply "Treb". This unit has five attacks, however it has only three ability slots. Two ability slots are available at Rank 1.
The first available attack, Stone Sling: Stone Block will lob a giant stone cube at the enemy doing 108-132 damage. The second available attack, Canister Sling: Corrosive Canister allows the Trebuchet to lauch a canister of corrosive poison at the enemy doing 68-92 damage with a 100% DoT for three turns. The other three attacks are unlocked later. Stone Sling: Fragmenting Block is unlocked at Rank 2 and will do 94-115 damage with splash damage of the 4 spaces around the target. Canister Sling: Napalm Canister is unlocked at Rank 3, which allows the unit to launch a canister full of napalm at the enemy doing 61-82 damage with 100% DoT for three turns. The last attack is Raptor Harness: Baby Raptor. This attack is unlocked at Rank 6 and allows the Trebuchet to launch baby raptors at the enemy. This attack will do 90-166 (6x), for a total of 540 to 996 damage to units without piercing resistances. It also has an Armor Piercing ability of 25% and a high crit rate of 15%.
Placing the Trebuchet in the first and second row is very risky due to its relatively low and lack of . It is better to place it in the third row or behind the protection and cover of a tank or Portable Wall so it is able to inflict damage on the enemy but stay safe and protected in the process.
Overall it is a good asset to ones army and will reward the player at Rank 6 (assuming they have 40 to get the Raptor Harness attack ability).