As a sea witch, Ursula has certain powers that made her a threat to King Triton.
1.She can conjure a magic bubble that allows her to spy on people. She used this bubble to spy on Ariel.
2. She can conjure magical contracts that when signed, cannot be broken. She tricked Ariel into signing one when she agreed to turn Ariel into a human.
3. She can transform merpeople into pathetic little polyps which she calls "poor unfortunate souls".
She used this spell also to permanetly wither Ariel into a "Poor unfortunate soul" so that her father will take her place and give her his power. she has also permanetly withered every mermaid into polyps including Attina, Alana, Arista, Adella, Andrina, Aquata, Diana, Cloe setori, Rikki chadwick, Emma gilbert, Isabella Hartley, June, Venus, Gabriella, Pearl,mylie Marina Aguas, Ishilly, Fillonce,Shirahoshi, Keimi, Mero, Kairen, Hiramera, Seira, Shyarly, the revived Otohime, the now young, slender and beautiful again Kokoro,Adele,Sora, Luca, Lulis and Fillonce's and Ishilly's red headed mermaid friend as well as Nixie, Lyla, Sirena, Nannay Istah, Quiana, Vexia, Miria, Isabel,Sheila, Lorelei because wants her garden to have all the mermaids since she is obessed with owning, imprisoning and turning mermaids into polyps and so that all mermaids will belong her. she has also permanetly wither the mermaid tranformed Santana lopez, Quin fabray and Brittany pierce into polyps. She has also turned the mermaid metamorphosed Cece Jones, Rocky Blue and Teddy Duncan into polyps.
4. Ursula can also transform both herself and other merpeople into humans. She used this power to turn both Ariel and herself into humans. she can also transform female humans and humans into merpeople she was able to permanetly turn brittany pirece, quin fabray and santana lopez into mermaids so she can wither the trio. She also turned Kokoro back into a young, slendy and gorgeous mermaid permanently so she can turn her into a polyp. She also revived Otohime back from the dead to transform her into a polyp. She also transformed Teddy Duncan, Rocky Blue and Cece Jones into mermaids so she can turn them into polyps.
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5.She can also mind control other merpeople and humans to so her bidding. She used this power to mind control Eric into marrying her.