The Scribe of the Royal Great Library of Orvelia. Using runes, he heals allies and erases beneficial magic from foes.
Here is what I believe to be a balancing mistake from the devs. When the devs created Baudouin, I'm sure they intended him to be an arena support. But perhaps he was too good at his job, as evident from the fact that he was in every arena team.
So the devs have two choices - to nerf Bau and risk incurring the playerbase's wrath, or to release a new hero that specifically counters him, which coincidentally also provides them with more income from Ruby purchases.
There's no need to guess which option they took - that's why Leo was created, that's why he's everywhere in arena now, and that's why he's extremely shitty out of arena. Leo's sole purpose is to erase Bau from existence in arena, and he does his job well enough, but outside it, he's pretty much useless.
Right now in arena, it's a game of cat and mouse - Leo is only popular because Bau is popular. His very existence pushes Bau out of the meta, which is why if you see Challenge League teams right now, they're literally all Leo teams with some Bau sprinkled in.
Leo's heal and damage skills are garbage when compared to the healing capability of Kaulah or the debuff capability of Phillop. His one defining skill, the silence, can be helpful in arena even with the absence of Bau in the opposing team, but he does have a counter...
Pros and Cons
+ Great in Arena, even with Scarlet meta + Is good to decent outside of Arena + Removes enemy buffs + Silences enemies + has P.DMG amp
- Not recommended for beginners. As Frey has more utility.
Rune of Frailty
Rune of Healing
Rune of Silence
40 sec Cooldown
??? M.DMG to the entire enemy team, and removes buffs. Also silences the enemy for 3 sec.
Rune of Protection
Every 20 sec, engrave a rune upon the ally with the lowest HP and for 10 sec, recover
[Light] ATK, DEF, HP +10% / Crit chance +100.
[Dark] Upon attacking, there is 10% chance of dealing 100% of ATK as M.DMG to a random enemy, while also removing 300 mana and inflicting Silence for 1 sec.
Belisa, Phoenix Quill
|Upon auto-attacking, there is a||10% chance||to deal 100% extra M.DMG and erase positive status effects.|
|Knights||Clause, Demia, Jane, Morrah, Phillop, Ricardo, Sonia|
|Warriors||Gau, Kasel, Naila, Priscilla, Scarlet, Theo, Viska|
|Assassins||Epis, Fluss, Gladi, Mirianne, Reina, Roi, Tanya|
|Archers||Arch, Dimael, Luna, Maya, Selene, Yanne|
|Mechanics||Annette, Lakrak, Miruru, Mitra, Oddy, Rodina|
|Wizards||Aisha, Artemia, Cleo, Lewisia, Lorraine, Maria, Nyx, Pavel,|
|Priests||Baudouin, Cassandra, Frey, Kaulah, Laias, Leo, May, Mediana, Rephy|