In my opinion the Hierotitan and the Casket of Souls are two of the Tomb Kings very best units. They are both very useful in establishing magical dominance within the game. Obviously they work amazingly well together, as their effects stack nicely, but in this thread I wanted to pit them against each other.
So, with all things considered, if you had to choose between the two, would you go with the Hierotitan or the Casket of Souls?
Well I’ll caveat by saying I’ve not played TK (the closest to it was before they split the books in 4th). The main reason I’d take either is for the boosts to spell users. I do think the +d3 to each casting roll from the Titan is better but it is limited to a 12” bubble. Also due to the size he will also be the obvious cannon bait and with T6 it isn’t that hard to take down. The casket ‘only’ gives an extra D3 power dice but at T10 is really solid and the range on the bound spell is considerable. I’d probably still go for the casket generally as I like allcomer, versatile lists but it would as ever depend on my list. If I was sporting a more light council orientated TK list, then the Titan would win hands down as the concentration of mages to boost banishment, combined with the multiple buffs to casting for all the mages by the Titan, would be too good to ignore.
Although I love both units, I believe that not only is the Casket of Souls better, it is the single greatest unit in the Tomb Kings army book. Tomb Kings units are typically underpowered, but I can't think of a single army in Warhammer that wouldn't benefit from fielding one of these bad boys.
Light of Death is a fantastic bound spell. First off, it's damage potential is excellent. Second, provides TK with an valuable tool to get around armour (which TK generally struggle with). Lastly, the 48" range is fantastic. I'd take Light of Death over both of the Hierotitan's bound spells.
One of the biggest advantages that the Casket of Souls has over the Hierotitan is survivablity. Toughness 10 is amazing against anything that might hit you at range. More importantly though, the Casket of Souls can be tucked away far from the enemy (preferably hidden from line of sight by terrain). Light of Death has great range, so that is seldom an issue. Light of Death also does not need line of sight on the enemy! Furthermore, the Casket's D3 power dice bonus works no matter where the casket is place, while the Hierotitan must remain within 12" of our wizards in order to apply its magic boost.
The Hierotitan is a great unit and it makes it into a large number of my army lists... but the Casket of Souls in an absolute auto-include, I have never fielded a TK army without one.