Unit causes Terror. Troops who are confronted by monsters or situations that cause terror must test to see whether they overcome their terror. If they fail, they are completely terrified and are reduced to gibbering wrecks. Troops only ever test for terror once in a battle. Once they've overcome their terror they are not affected again. If a creature causes terror then it automatically causes fear as well, and all the rules described for fear apply. However, you never have to take a Terror and a Fear test from the same enemy or situation - just take a Terror test: if you pass the Terror test then you automatically pass the Fear test, too. As any unit of Troops only ever takes one Terror test in a battle, any subsequent encounters with terrifying monsters or situations will simply count as fear. A unit must make a Terror test if charged by or wishing to charge an enemy that causes terror. A unit must make a Terror test at the start of its turn if there is an enemy which causes terror within 6".
Add +1 to be hit for shooting
Some creatures are utterly fearless and will never give up a battle, no matter how hopeless the situation might be. This could be because of the troops' extreme bravery, or because the creatures fighting are not truly alive. These troops never break in close combat, and they are also immune to panic, terror and fear or any other Psychology rules. If defeated in close combat (even by fear-causing creatures that outnumber them) unbreakable troops continue to fight on regardless of results. They may never, however. declare that they are fleeing as a charge reaction, as they will literally die fighting under any circumstances.
For all intents and purposes the Rat Tank acts and uses the same rules as the famed Empire Steam Tank, which can be found in the Warhammer Annual 2002 (UPDATED IN CHRONICLES 2004, P.48). The Rat Tank has 25 Hull Points. The rules are massive, so just check the book ("Warhammer Chronicles 2004" by Alessio Cavatore, p.48-53) or follow the link https://6th.whfb.app/special-rules/steam-tank
