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5 Leman Russ Variants from the following list: Standard, Conqueror, Executioner, Exterminator, Tank Destroyer, Thunderer, Demolisher and Vanquisher. No restrictions apply.
Certainly the Thunderer should not be allowed - it is a field conversion of damaged Destroyers and thus not sanctioned by the AdMech. I'd be inclined to dissalow the Exterminator as well. The Conquerer seems like a good one to disallow, but backgroundwise it really should be available as the list is themed around Gryphonne IV (the design was first rediscovered on Gryphonne IV and this is the only forgeworld it is produced in significant numbers).
I'd say Standard, Vanquisher (a 'rare and sophisticated' variant) Destroyer, Executioner, and Conquerer.
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use variants that are rarely used by the normal imperial guard
In terms of the background they are more likely to use Baneblades and Shadowswords rather than anything else - they are the most advanced of the SHT variants and consequently greatly prized by the AdMech. In fact, they shouldn't use Stormswords at all - which was 'originally a field workshop conversion of the Shadowsword... such vehicles are 'unnoficial' and frowned on by the conservative upper echelons of the Adeptus Mechanicus' (Imperial Armour I). I'd say a choice between Baneblade, Shadowsword and Stormblade (plama just screams AdMech to me, and it is an 'official' AdMech variant).
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Another possbility would be to call them AdMech SHT variant and give them some cool gimmick like an invulnerable save to distuinguish them from normal SHTs. Or a speed increase because they have better engines. Just some ideas.
This might be an idea - its also supported by the background, which states that there are increasing numbers of 'second generation' Baneblades in use that are inferior to the 'true' Baneblades constructed at Mars and other favoured Forgeworlds with access to all the STC data. The 'true' versions have superior weapons, 'improved internal armour bracing, greater engine performance and transmission' and other secondary systems vastly better than the 'second generation' vehicles.