Published: February 24, 2026 | Updated: 3 October 2026 | Reading time: 6 minutes
Mythical creatures are among the most popular themes for online slots. Dragons guard treasure, a phoenix rises from the ashes during free spins, a kraken drags symbols off the reels. The artwork and sound can be excellent – but none of it decides whether you win.
This article separates the two layers of every slot: the theme (what you see and hear) and the maths (what actually determines results). It also shows how to read a game’s information screen, so you can compare games on substance rather than on dragons.
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Why myths make good slot themes
Creatures from myth and folklore come with ready-made stories that need no explanation. Dragons appear in both European and East Asian traditions – in European tales often as hoarders of treasure, in Chinese tradition as symbols of power and good fortune. The phoenix of Greek and later legend is reborn from its own ashes. The kraken comes from Scandinavian sea folklore. Unicorns, griffins and Medusa are just as recognisable.
For game designers these stories map neatly onto features: “rebirth” becomes respins, a “hoard” becomes a jackpot or collect feature, a sea monster “grabbing” symbols becomes a wild or symbol-removal mechanic. It is good storytelling. But the story is only the costume worn by a mathematical model.
The theme is art; the RNG and paytable are the game
An online slot uses a random number generator (RNG) to pick the reel positions for each spin. The paytable and the reel configuration determine what each outcome pays. Two games can look completely different and have very similar maths – or look almost identical and behave very differently. A dragon does not make a game generous, and a cute theme does not make it gentle.
The four numbers that matter
RTP (return to player)
RTP is the share of all money staked that the game is designed to pay back over a very large number of spins. An RTP of 96% means a theoretical average return of €96 per €100 staked in the long run; the remaining 4% is the house edge. It says nothing reliable about a single session. Some providers release the same game in several RTP configurations and the casino chooses which one to run, so check the figure on the info screen of the site you actually use.
Volatility (variance)
Volatility describes how results are spread out. Low-volatility games pay small wins often; high-volatility games have long stretches of small or no wins and rare large ones. Two games with the same RTP can feel completely different because of volatility.
Hit frequency
Hit frequency is how often a spin produces any win at all. A hit frequency of 25% means roughly one winning spin in four on average – but many of those “wins” return less than the stake. Not every game publishes this figure.
Bonus-round contribution
Part of the RTP is paid in the base game and part in features such as free spins. In many modern slots, especially high-volatility ones, a large share of the RTP sits inside the bonus round. The base game on its own then returns noticeably less, and your session result depends heavily on whether, and how well, the feature lands.
A worked example (hypothetical game)
Assumptions – an illustrative model, not a real game and not an offer: a slot with 96% total RTP, of which 62 percentage points come from the base game and 34 from free spins. Free spins trigger on average once every 150 spins. Stake: €1 per spin.
| Quantity | Calculation | Result |
|---|---|---|
| Expected return per €1 spin | 0.96 × €1 | €0.96 |
| Expected loss per spin (house edge) | €1 − €0.96 | €0.04 |
| Expected loss over 500 spins | 500 × €0.04 | €20 |
| Base-game return per spin | 0.62 × €1 | €0.62 |
| Average value of one free-spins round | 0.34 × 150 × €1 | €51 |
| Expected number of features in 500 spins | 500 ÷ 150 | ≈ 3.3 |
The averages hide a lot. Between features, the base game in this model returns only about €0.62 per €1 spin, so the balance tends to drift down until a feature lands. The trigger is random: you might see none in 500 spins or several in quick succession, and a single round can pay far less or far more than the €51 average. This is what high volatility feels like in practice.
Feature buys: same maths, faster and bigger swings
Some slots let you pay a fixed price – often a multiple such as 50× or 100× the stake – to go straight into the bonus round. The option is not offered in every game or in every jurisdiction. In general terms:
- The buy has its own RTP, which may be shown separately on the info screen and can differ slightly from the base RTP.
- Expected cost of one buy = price × (1 − buy RTP). Example with assumptions: a 100× buy at a €1 stake costs €100; if the buy RTP is 96%, the expected loss is €4 per purchase – the same 4% rate as spinning, but concentrated in one €100 decision.
- Because you skip the cheap base-game spins, money moves much faster and the swings are much larger. A few buys can use up a budget meant for hours of play.
How to read a slot’s info or paytable screen
- Find the RTP. It is usually in the help or “i” section. If there is a buy feature, look for a separate figure for it.
- Check the volatility. Many providers state it in words or on a scale; if not, a large share of the RTP in features is a hint of high volatility.
- Look at the maximum win and whether it is capped – a cap limits the top end of outcomes.
- Read the paytable. Note what the common symbols pay relative to your stake; this is what you will see most of the time.
- Read the game rules. How the feature triggers, whether wins are multiplied, and what happens to an unfinished round if the connection drops.
Terms such as RTP, volatility and wagering are explained in our glossary. For why a run of dead spins doesn’t make a feature “due”, see our article on streaks; for how game choice and stake size shape your expected cost, see what actually affects outcomes.
Choosing a game with your eyes open
Pick a theme you enjoy – that is what it is for. Then let the numbers decide whether the game suits your budget: a higher RTP lowers the expected cost, and lower volatility makes a budget last more evenly. Set a budget and a time limit before you play, and remember that every slot has a negative expected value. A few practical habits are collected on our tips page.
Frequently asked questions
Do dragon or phoenix slots pay better than other themes?
No. The theme has no effect on payouts. Results come from the random number generator and the paytable, so compare games by RTP and volatility, not by artwork.
What is the difference between RTP and volatility?
RTP is the long-run average share of stakes paid back, for example 96%. Volatility describes how unevenly those payouts are spread – frequent small wins or rare large ones.
Is buying a bonus feature a better deal?
Not in expectation. You still lose the house edge on average, only on the full buy price at once. It mainly makes the swings faster and larger.
Where can I find a slot’s RTP?
In the game’s help, info or paytable screen. Check it at the casino where you actually play, because some games exist in several RTP versions.