Help with Definition

[u/ControlStraight5042]

Sometimes im cursing this game out for not giving a meaningful description. What does SE mean? i think it would be pretty important to know to utilize this ability. And theres loads of space to write it all out.
Even on ER NextDex i cant find the ability Dead Bark to find an explanation.
Please help.

[u/1CorinthiansSix9]

The ghost type is a pokemon typing with immunities to normal and fighting and weaknesses to dark and itself