Primal magic

Primal blood magic ideas:

Written as a scroll ahead of time. You "Craft" a scroll using a setup, with the effect and respective key defined at this point. Right clicking with a scroll bind the effect to the key. Depending on the items used, the effect differs and if the spell can use set items(Shards can buff power, slates can lower cost.).

The perks of this system is that you willingly create spells so someone can't complain about dying without ever starting blood magic. A player can have a few extra scrolls on there person to change effect in the field. Scrolls can easily be traded between players.

Concepts:

Perhaps some effects can have a variable cost, so that each cast has a chance at having a lesser or greater then average cost. This would cause players in theory to take risks, and feel lucky when they get a lesser cost. An example would be a three point spell has a five percent chance of costing one, a ten percent for two, seventy percent for three, ten for four, an a five percent for five. This would reflect the imperfect nature of primal magic, and perhaps a slate shift the odds more in your favor.

I'll run with the idea that an effect might have a "Cast time", so accidentally tapping the button doesn't trigger a warp home effect for example. While casting, the players movement attribute is greatly lowered.

Possible effects:
Note: I will be giving numeric values for cost, so "one" is half a heart and "Two" is a full heart.
{Template:

Name, cost, level(Norm is normal,blood is weak blood shards, demon is demonic blood shard, crystal is demon invasion shards), does it need a reagent item and if so what.
}

Utility effects:
Red lamp, one, norm, no: Creates a temporary blood lamp block that emits a redstone signal and despawn after a few seconds. Just a generally useful effect.

Fell tree, two,norm,no: Used on a log, this effect breaks a log and all nearby logs. A quick and easy way to grab a few logs in the field.

To build a bridge, three, norm, no: Creates a quick bridge of spectral blocks in the direction you face, to quickly cross a gap.

Need a light, two, norm,no,: In an area centred on the the activator, scan for blocks dark enough to spawn mob and place a blood light.

Risk, eighteen, blood, weak shard: An area around the player becomes "Warded" to prevent mob spawns. Lasts a minute or two.

Pass it on, one, norm, no: A simple convenience effect that lets you utilise a basic or complex spell using keybind. Normal LP cot applies, this is just a cost to activate it without need of the crystal.

Combat:
Chill, four, blood, no: Short ranged projectile light on damage, but slows the mob hit to the point of near immobility.

One little sip, two, norm, no: Allows you to bind a potion effect from a flask to this spell. Power is always one, and the duration is short, perhaps thirty seconds.

Freeze, three, norm, no: Puts out fires, chills water to ice and lava to obsidian.