I'm kinda of curious, does the napalm also increase dagon on bat?
It doesn't increase the damage of dagon, but rather trigger 1-tick damage toward napalm.
Let's say you're lv 7 Batrider, and you rushes
1) lv 1 dagon; 400 damage
2) Max out sticky napalm (25 dps per stack)
Let's say the situation is like this...
1) You've stacked the napalm on the enemy 7 times so...about...175 extra damage.
2) Enemy have no magic resistance
Your total damage would be 400 + 175 = 575 total damage toward an enemy without any magic resistance.
Now let's do it with Urn of shadow...which has a duration of 8 seconds and deal 25 dps/sec upon uses.
So..8 seconds means 8 tick that sticky napalm can trigger.
Now let's try the same scenario above with Urn of Shadow
8 x 25 + 200 (from urn of shadow) = 400 from just 1 stack of napalm
8 x 25(7) + 200 (from urn of shadow) = 1600 dps from just 7 stack of napalm.
1,600 damages...for a level 7 batrider is pretty insane.
Imagine you're kill people left to right from just doing urn + napalm tick in pub games. Pretty much the enemy team is screw, and there's nothing they can do lol.
Now if you tried this same method with a pre-made or pro team. They'll have 2 people from top/bottom lane going coordinate ganks and end the game smoothly. If you're get lucky and got a few charges. You'll can basically one shot any support on the enemy team pretty easily and turn the game around for your team.
My point is...it's pretty broken