BGaming and Golden Goat Gaming built Clash of Gods Power Duel around a contest between Anubis and Hades. The Egyptian and Greek figures provide more than the setting. They also identify different feature behaviour.
When a duel affects an outcome
The official game description says a duel takes place when the VS symbol is part of a winning combination. The result then determines which multiplier is used. A battle shown in the artwork should therefore be distinguished from the specific symbol condition that activates the feature.
The two feature styles
BGaming describes Anubis as using expanding wilds that remain for the feature and Hades as a higher-volatility alternative with at least one expanding wild per spin. Volatility describes the pattern and variability of outcomes. It does not make one version a reliable source of larger returns over a short session.