"only XL-3"

Clearly and concisely: we need to assign colors in the tables to determine the turn order for the castle selection. To avoid confusion, it's better to use colors other than red and blue, such as white and green. Next, we'll slightly change the order of the items in the rules:
2. XL templates: 8mm6a, 8xm12a, 6LM10a, 8xm8a, Spider.
3. Standard castle selection: green starts, white makes the final choice.
4. Castle selection: random pair + negotiation.
The host generates a random pair of castles using a special button. Immediately after generation, each player can request a regeneration once for 500 coins, which the opponent must pay. If, during regeneration, at least one castle is repeated, the same player can (but is not obligated to) request a free regeneration until a new pair of castles is generated.
5. Negotiation for color. (who starts doesn't matter)