In svs thé dmg dues to smite can go on mana with dgtm ??

Dtgm is a very bad modifier. Especially for Paladin as they don’t have mana issues.

Let’s say you have 10% DTGM. You receive a hit that deals 100 dmaagw to you.

You get 10 mana added to your mana pool
You still take 100 damage.

This is how dtgm works.