The parts are coming together, and I'm doing a big rethink on Stronghold rules. I want to strip things back to regular HOTT rules there. And I've streamlined the winter God FX so they are consistent.
God: Seen as thick fog countering the danger posed by dragons getting near the White Walkers. See special rule 1. As per rules the God departs when the Night King rolls a PIP of 1. Cost 4.
Aerial hero general (Night King). The dragon mount seems not to make any attack that takes more than one element in one round, so there is no need to pay dragon points. Cost 6. See special rules for dismount and wall attacking.
Cleric sub-command White Walkers. They are depicted as riding but move at foot pace. In this version their function is to exert line of command regardless of aerial hero general placing, provided he is within 1200p of them. They can apply PIPs to sacrifice elements. Cost 3.
11 more points from Hordes of undead. They all count as foot in this scale of battle: the odd giant or two has no effect on mass action.
2 handicap points owing to higher-point "overhang" are donated to the defence for bonus fortifications.
Jon Snow accompanied by various other heroes as 1 x Hero General, Cost 4. Jon is useless in the TV version, contributing nothing other than dragging Sam to his feet, but in this version can at least exert command.
Daenerys with two dragons as 1 x Dragon. Cost 4. Dragon is summoned as per book but may deploy on top of the Stronghold.
Dothraki loyal to Daenerys as 2 x riders. Cost 4. In at least the first run-through these will be off the board, behind (ie south) of the stronghold.
Unsullied loyal to Daenerys as 2 x Spear. Cost 4.
1 x Artillery. Cost 3. In this refight Artillery will be direct fire ballistae, placed on those enormous round firing turrets Winterfell has.
Northern armies loyal to Jon Snow as 2 x Warband. Cost 4.
Flaming ditches as Lurkers. Cost 1 initially.
Special rules for the attacking side
1. 6 PIPs (that may be saved from turn to turn) must be spent to "summon" a winter God. Once summoned it limits command, even among friendlies. It is not placed directly on the board, instead operating as an effect.
Friendly: The Night King can wield command directly, normal rules applying, or through his White Walker cleric support element within 1200p, and they in turn must be in base to base contact with elements they command. During the god's effect any distance greater than 600p between enemy general and his elements counts as being beyond 1200p, meaning that a 2 minimum PIP must be rolled to move other elements.
Hostile: enemy PIPs that are spent on movement that does not begin in base to base contact with the enemy general may be consumed by the winter God. Each enemy movement phase the God rolls 1d6. That score can be used to cancel or "consume" PIPs to a total of the God's score. This special rule also applies to enemy hidden movements under defending special rule 5.
2. While aerial the Night King fights as a Hero, obeying the normal rules for Aerial Hero. Specifically he can be destroyed by Hero or Artillery. Otherwise, if a dragon would be destroyed or be forced to flee by the result (eg attacks stronghold, or loses land combat) see special rule 3.
3. If the Night King's mount is lost ie forced to flee under dragon results the Night King heroically lives, counts as ensorcelled, and is placed adjacent to the stronghold wall closest to the event, even if that places him adjacent to an enemy figure. While ensorcelled he may defend but not initiate attacks regardless of base to base contact. He is not a target for range fire while ensorcelled.
4. The Night King can summon lurker undead no more than one base width distant, one summon at a time. He may summon undead within the stronghold after the first unsuccessful assault attempt. If within the stronghold they cannot "take" it but support attacks on the stronghold, counting as one of three maximum elements.
5. The Night King or his cleric proxy can "burn" one Horde element to make any linear obstacle crossable. Obstacles stack, for example a burning trench on the same base depth as a rampart wall adds one further Horde cost for a total of two. Other command and control rules apply to the element(s) to that point.
6. Solo rules for the Night King: The horrors of the night will ignore any tactical concerns and simply advance as quickly as possible towards the closest enemy to them. The White Walkers will advance on the nearest opponents, attempting to take advantage of cover as they do so. They will try to close the distance at least half their base move each turn.
If remaining in cover from missile fire would prevent this from happening (or they are facing no opposition with missile weapons) they will move at full pace by the shortest route possible.
The Night King himself is chiefly concerned to get several undead elements to the stronghold, then attack it directly or get within one base width and summon undead and attack it. Until that time he must remain out of Artillery range and counter the enemy dragon as best he can. Once at least one horde reaches the stronghold the Night King must attack as directly as prudently possible.
Special rules for the defending side
1. The stronghold is deemed to contain Artillery. Artillery may fire over friendly elements, has a range of 500p from the circumference, and has 360 degree field of fire, but may not fire upward above 15 degrees.
2. 6 PIPs (that may be saved from turn to turn) must be spent to "summon" a burning trench linear obstacle that is no more than 3 base widths length but may be of any angle. Its placement may be adjacent to or under any friendly element outside the Citadel. It attacks all non-aerial elements that are on top of it or attempt to cross it, as Lurker, but deducting 2 from them for its terrain. An element defending the wall is not attacked by a flame trench lurker.
3. After or on the same turn as the first 6 PIP sacrifice, two more burning trenches may be summoned for 1 PIP per trench, with the same attributes as the first.
4. Other linear obstacles (chevaux de frise from nearby forests, simple rampart and ditch walls) are permitted but must be placed prior to the attacker's first PIP roll. Their minimum length is one base width and the total length of all combined cannot exceed the combined base widths of land elements deployed on the board outside the fortress. Linear obstacles of the rampart type prevent enemy contiguous base support, and add 1 for any element defending the obstacle. Linear obstacles of the c-d-f type add 1 for any element defending the obstacle and also 1 for warbands or spears defending across them as though rear-supported, but do not prevent enemy flank support.
5. In any version that Dothraki riders are held as an off-table reserve, a flanking move may be attempted. There are two conditions. (1) while the winter god is not deployed a side-edge Dothraki deployment is successful on a 2-PIP buy AND the roll of 6 the first time, 5 or 6 the second time, 4 5 6 the third, and so on to the sixth attempt. The Rider elements may be deployed separately but the same conditions apply to each such. (2) the deployed winter god can prevent comms from signaling such an advance. During the defence "success roll" phase the god rolls a d6. If the score is equal to or better than the "success" d6 the deployment is canceled ie not nullifying the count but not advancing it. Of course once deployed the riders may still lose their PIPs to the winter God as outlined in attacking special rule 1.
The only victory possible is Citadel falls (attacker) or Night King is slain (defender). Other losses are ignored in terms of victory conditions.