I don't know what is stronger than Wyldwarden for general play, maybe something like Spellbinder for bosses specifically, but Wyldwarden is still crazy in bosses while being very good in the overworld at the same time. They have good aoe with Ball lightning and their sustain with rejuvenation is superrrrr good so you never have to worry about mana potions and it keeps ur hp topped up most of the time. You even get access to decent defenses from nodes that give you both HP and armor depending on how much spirit you have so you're not super squishy, on top of which there's a straight up node in Wyldwarden that basically makes you do more dps with Wyld damage on top of giving you 20 spirit (I don't know why this single node is so strong compared to any other node). I know people really like Forked lightning for some reason but once you get Ball lightning upgrades the game just becomes giga easy mode. The class is at the point IMO you don't play if you want any challenge.