It's a 15% increase OF the 30% I believe, so 30% becomes 34.5%

I wouldn't really focus too much on the HP of Relics BUT if you want to see their full stats, go to the Forge and then Relics and Relic Index.

Malefic becomes 50% chance fully leveled/ranked but still 20% dmg.

Anywho here's what it looks like when you go to the index:

i

Give her an accuracy banner and speed boots then you're good. She's a decent nuker but she needs to have a turn. Even if she doesn't wipe the team, most of their skills are on cooldown and sets up for your second nuker will finish the job. She's soft counter to wukong bc when he comes back, his skills are on cd  https://vidmate.onl/