Bone Spells and Power Siphon, Overview Feedback

Recently I started a physical/bone caster on a witch, the emphasis was initially Bone Blast from my wand, Unearth, and Bone Storm. Then switching to Bone Storm, Power Siphon from the wand, and Unearth. I have a couple things to say after using those skills. Ultimately after some headaches about the usage of the skills I changed that character into a Minion Build

The main issue I have is that the full potential of the bone skills, aside from Bone Blast, require killing enemies or consuming corpses to get that effect. On kill and corpse affecting skills are essentially unusable on 2 of the 3 bosses in the campaign alone, not to mention those bosses and other minion-less bosses in the maps. When talking about bone skills we have 1 skill that does not end up working most of the time (bone blast) and two skill that are either directly or indirectly tied to a corpse or on-kill affect.

1. Bone Blast
This skill is one of my favorite skills out of the bone spell group, it does a good amount of damage with the added bonus of a on bleed affect. The issue with this skill is that when a target is on the screen it automatically targets the center of the nearest enemy. This auto-aiming is part of the problem, the skill casts on the group and waits to long to actually do damage, letting the target easily move out of the aoe, even the slower enemies. If this skill was able to just cast where I want it, regardless of what enemies are around and what they are doing, I can aim it in a way that it goes off right when the enemy is over the target.

2. Unearth
This is one of those skills that require a corpse/enemy death. In the case where there are plenty of corpses this skill is great, I remember doing really well against The Devourer, which has a lot of small summons. The issue is that if there are enemies that do not produce corpses or allow you to kill minions to make corpses half of this skill no longer works.

It would be interesting to see the minions either be a chance to summon on cast, maybe they could consume bone storm ground shards to do another effect. Because right now the skill Unearth is essentially a very under-tuned version of Summon Raging Spirits, where a number of minions are summoned just for using *any* fire spell.

3. Power Siphon
The main issue with this skill is that the power charge generation is completely reliant on other enemies dying, which are required for Bone Storm to fully work.

4. Bone Storm
This is a great spell as well, I had a lot of fun using this one as well, the main use of the skill has no issues, outside of a few notable bugs. The main issue is that in order for the shards put into the ground to explode, you need to have power charges, which require the death of any enemy.

All together there is one bone spell that is mostly unusable do to the auto-targeting, and two spells that are really only fully functional in a few scenarios, and not fully functional in boss fights that are basically gatekeeping further progress in the game.