Magical Buffs: The Support Caster is Stronger Than He Realized! (Manga) Vol. 3 by Eiri Shirai

Nachtlibelle ventures to the untrodden level ninety-eight. Assigned to the vanguard to cast buffs and utilise his "Trap Detection" ability, Wim Strauss demonstrates his power in full force. Progress is smooth - until they encounter the strongest boss they've ever faced. As the water rises and cuts off their escape routes, Camilla steps onto the front line!
Binding: Paperback / softback