Aaliyah had already chosen the necessary trick.
There aren't many common tricks available for Druids to choose from.
Gauss already mastered the Repair Technique. The same goes for the Fire Spell; its functionality can be replaced by similar tricks and spells that Gauss has. Thorn Whip is a weakened version of the Entanglement Technique, whereas she already mastered the Oak Club Technique.
For the sake of the team, she purchased the Guidance Technique.
The Guidance Technique is a supportive trick used in non-combat scenarios, which can bestow blessings on oneself or other targets. Due to it being a trick, the strength of the Guidance Technique is generally limited and cannot take effect in intense battles. However, in other instances, such as exploration, trap investigation, negotiation, climbing and jumping, interpreting runes or complex knowledge, recalling events, etc., bestowing a blessing can help make the caster state better and easier to complete the task at hand.
