New Geomancer Player Using “Dia”

I went with a few groups and players asked me (Geo sub whm) to use “Dia / Diaga” after using indi or Geo spell.
What is the main purpose? Won’t I overwrite higher tiers Dia spells if applicable?
Thanks

Dia & Bio can't overwrite each other if there's a higher tier version on the mob.

The idea is put get yourself on the hate list of the mobs because if you are using a debuff Geo bubble, it won't apply to the enemies if you don't have hate on that enemy.

You can also cure someone who is on the hate list, like a tank or whoever slept the mobs (if applicable).

Dispelga, sleepga, or similar spells work as well.

If you're using only buff bubbles (Indi-Fury, Geo-Barrier for example) this step isn't necessary.

I think you just don't get automatically on the hate list of enemies if they step/stand inside the range of your debuff bubble but you do get on the hate list of the target you cast the geo debuff bubble on.

Dia for mobs we wont sleep ever, cure for when i have a tank who gets aggro first.