完全に魔物化してしまった仲間が、敵モンスターの群れに加わってしまう ↓ 【その仲間を見捨てて逃走する】 ↓ 《見捨てた状態のまま“数日”経過する》 ↓ 敵モンスターの群れ全体のLvが上昇＆強化。 魔物化した仲間も〈存在進化〉して、上位個体となってしまっている そんなTF・RPGゲームやりたい

I’d like it if it ends up a risk and reward mechanic. On one hand, the enemies are tougher, and you’re down a party member. On the other hand, if you beat the zone boss that’s controlling the horde, you get that party member back… But it doesn’t undo the transformation, so while they are stuck like that, since the new form is stronger, the party is stronger for it in the long term. Could even have a narrative angle. The various tribes being mind controlled by the zone bosses, who are servants of the demon king. So the reason the hordes are even attacking you to begin with is because of them… … So after the zone boss is dealt with, the only horde type still attacking you in that area are bandit variants of that race. And meanwhile, with the zone boss gone, you might also meet merchants of that race as a random encounter, who will sell you items that are unique to their tribe. … But to more directly address the starting idea, I think if you can lose party members, and there’s nothing you can do to get them back or replace them, the game ends up being a battle of attrition… Leading people to restart whenever they lose a party member, at least if they want to progress. … Also, having party members be something that can be abandoned, just to pick up a new one, undermines some ability to build a story around your party members. For these reasons, the specifics of how the idea is implemented can determine if people have the patience to continue.

見捨てた仲間が産んだ子モンスターとか出さないのですか？ヒロインも任意の魔物に変化させられると嬉しいです。

更に日数経過で、面影がある仔モンスターが複数体産まれて フィールド上を闊歩してると最高ですね……

そこをもっかい加入させると…

呪いと使い魔と隷属のカードや、Succbus Quest辺りだろうか… 昔、RPGツクールで仲間が攫われる→寄り道してたらボスモンスターになって倒すとモンスターのまま仲間に→TFした仲間は拠点の街を汚染→TFしてる味方の数で、勇者、悲劇、逃亡、魔王の４ルートに分かれるゲームを作ろうとして挫折した。