can this troll be used like a isenguard/mordor troll on its own. and when you do buy it for the catapult upgrade does it use the mordor troll stat blox. and last question can he move away from the catapult at any time with out penalizing the catapult.

Yes, you can use it as a Mordor troll on its own. Agree with your opponent if you're gonna proxy it for an Isengard troll.

Yes it uses the standard Mordor troll stats.

No - if the troll moves away from the catapult (or at all), then the Mordor catapult will not be able to fire two shots that turn. Otherwise it will be able to fire as usual.

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thanks

just a quick add-on ; if you play WOTR, it comes in might handy as a 'basic' mordor troll as the catapults dont use troll upgrades in that game ; could potentially give u 3 mordor trolls for 'free' in that circumstance