Escalation Spiral

During each player's first four turns, only Souls on proactive slots may:

1. aattack;
2. bcast Events (the Caster's slot must be proactive);
3. cset Ambushes;
4. dbe equipped with Armaments;
5. euse Activated Effects.

Not limited by the spiral: recruiting, invoking Realms, springing Ambushes, the effects of Realms, and every effect that is not activated (Static, Instant and Timing Effects, so Reinforcement works on any slot).

Each player counts their own turns. Player B's turn 1 and Player A's first turn (turn 2 of the duel) are each that player's first turn.

At the start of each of their first four turns, the turn player chooses one of their own slots of a given rank. It becomes proactive at once:

1. afirst turn: a rank-0 slot;
2. bsecond turn: a rank-1 slot;
3. cthird turn: a rank-2 slot;
4. dfourth turn: a rank-3 slot (the central rank-3 slot or the altar).

At the start of the next turn, every slot of the rank chosen last turn becomes proactive too.

The chosen slot may be empty. What becomes proactive is the slot, not a Soul: it stays proactive whoever stands on it.

Once a player has chosen their rank-3 slot, the spiral ends for them: from then on every slot of theirs is proactive.

So, turn by turn:

1. afirst turn: the one chosen rank-0 slot;
2. bsecond turn: every rank-0 slot and the chosen rank-1 slot;
3. cthird turn: every rank-0 and rank-1 slot and the chosen rank-2 slot;
4. dfourth turn and later: every slot.

A Leader's Activated Effect can be used once its altar is proactive: from its controller's fourth turn on, at the earliest.

Souls recruited before the first turn may attack in their controller's first turn only from the slot woken in that turn (6.5.2).

An Ambush at a slot that is not proactive can still be sprung; only setting it needs a proactive slot.