For designing Dromoka, two features were at the centre of my design: Dromoka’s resilience, which is exemplified by her high armour class and hit points, and secondly her ability to share that resilience. In the same manner as the other ancient-Tarkir-era dragonlords I’ve designed, Dromoka has an ability granting a benefit to all dragons within 100 feet, hers being a boost to AC. This is coupled with the Bolster legendary action, which is similar in function to the shield spell, representing Dromoka magically imbuing one of her scales for a short time, and granting it to an ally, like we see in the card Dromoka’s Gift. One other noteworthy feature of this version of Dromoka is that her breath weapon is a beam, rather than a cone, and actually deals more damage than ancient-Tarkir-era Atarka’s fire breath. My reasoning was that in white-aligned fashion, Dromoka’s breath was far more focused and directly devastating than the wild fiery breath of Atarka – I based this on the art of Citadel Siege.
In her Elder Dragon form, Dromoka’s greatest strength is her resilience, with a nigh-unbreakable AC of 26, and the spell resistance granted by her Antimagic Scales ability. Her other abilities are scaled appropriately, and her Bolster legendary has action has been replaced with the more powerful Scale Blessing, allowing Dromoka to aid more of her allies. For characters that fight Dromoka at this stage, Dromoka’s resilience means that combat will have to involve clever planning, and fighting in an environment that puts her at a disadvantage to counter her mighty defences.