The Bible does not name modern games
Scripture does not mention Dungeons and Dragons or modern fantasy role-playing games. So the question is not answered by a simple label. Christians need to consider what they are actually doing, what the game celebrates, and what effect it has on them.
Paul told the Corinthians that not everything permitted is helpful or strengthening. He also asked them to seek the good of others, not merely their own enjoyment (1 Corinthians 10:23-24). That gives a useful starting point. A game can be imaginative, social and harmless for one person, while becoming unhelpful for another.
Playing an invented character in a fictional world is not automatically the same as believing in or practising what that character does. Yet make-believe is not beyond the reach of Christian wisdom. Ask honestly: does this activity help me love what is good?
All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.
Keep clear of real occult practice
The Bible speaks firmly against divination, sorcery and attempts to gain spiritual power apart from God (Deuteronomy 18:10-12). In Ephesus, people who had practised magical arts turned from those practices when they came to faith in Christ (Acts 19:18-19). Christians should not seek spells, spirits, curses, fortune-telling or hidden knowledge as real power.
That does not mean every story containing a wizard, dragon or imaginary magic is itself an occult practice. The important distinction is between fictional storytelling and genuine spiritual involvement. Still, if a particular game invites players to explore real-world occult material, treats evil as admirable, or stirs a desire to experiment spiritually, that is a clear reason not to take part.
There shall not be found among you any one that maketh his son or his daughter to pass through the fire, or that useth divination, or an observer of times, or an enchanter, or a witch,
Pay attention to your conscience
Romans 14 deals with disputed matters among believers. Paul urges Christians not to judge one another carelessly, while also refusing to push someone to act against conscience (Romans 14:13-14). He says that acting without faith is sin for that person (Romans 14:23).
So you do not need to copy a friend's freedom, and you should not shame a friend whose conscience leads them to abstain. Perhaps fantasy games once connected you with fear, obsession or a past involvement in the occult. Perhaps their themes leave you unsettled. In that case, choosing another way to spend time may be a wise and peaceful decision.
On the other hand, someone with a settled conscience may enjoy a carefully chosen game as a form of creativity and friendship. They should remain humble, willing to stop if the activity begins to pull them in an unhealthy direction.
Choose what helps you honour Christ
Paul gives a broad test for ordinary choices: do them for God's glory (1 Corinthians 10:31). Philippians 4:8 points believers towards what is true, honourable, just, pure, lovely and worthy of praise. Those verses do not require every story to be cheerful, but they do ask what a habit is shaping within us.
Consider the people around the table too. Does the group encourage kindness, patience and friendship, or does it become cruel, sexually explicit, consuming or dishonest? Does the game crowd out prayer, church, responsibilities or real relationships? A good activity can become a poor master.
You might set clear boundaries about the kind of campaign you will join, avoid content that compromises you, and be ready to leave if needed. Test the activity rather than assuming either that all fantasy is evil or that anything called entertainment is harmless (1 Thessalonians 5:21-22).
Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God.