What I don't like is that you cannot use the special arrows with the sneak attack of the Rogue. Do you think they could be made usuable or would that feel unbalanced to you?
I think whenever stuff like sneak attack will be transferred to pop ups and enable combining it with other attacks (including arrows) would impact what arrows should do (also: are arrows part of multiattack at the moment, or are they treated like consumables?).
If combined damage is too much, one could even keep the arrows base damage, and just make it elemental (which would still make them useful depending on enemy resistances and vulnerabilities) and make the effects the “special thing”.
It is difficult to speak about item economy without seeing the final game. Will there be crafting, for example?
Oh yes, I didn't explained the status well.
Frozen (homebrew status) description is something like "your feet are frozen in ice, you can't move".
Movement is reduced to 0, but characters can use all their actions/bonus action/reaction.
Ah, thanks. That would be fine. Did you consider per-turn saving throws to shake off the status? 5e does quite a bit of that. That way you could even extend effects by, let’s say one turn, and hopefully it wouldn’t get out of hand. I also wonder if Ice’s ability check, shouldn’t be strength - for one to diversify check’s further, and roleplay wise, it makes more sense for me for a character to “break” through ice, rather than dodge it.