Not released yet. Tephesia is in the current AFK Journey client with the kit below, but the servers haven't released this hero. Skills and numbers can change before launch.
// OVERVIEW
ABOUT TEPHESIA
Tephesia is an 
S Level 
Graveborn 
Support hero in AFK Journey.
// KIT
SKILLS
// ADVANCED
PROGRESSION SYSTEMS
EX
◆EXCLUSIVE WEAPON
Moonveil Batwing Parasol
Blood Offering
The game files keep this skill's details hidden until the hero is released.
EX+27Rivalry Skill: Support: In Rivalry Mode, the first ally to drop below 40% HP is healed for 160% ATK HP and granted a shield equal to 160% ATK.